[{"data":1,"prerenderedAt":4106},["ShallowReactive",2],{"post:\u002F2026\u002F03\u002F11\u002Fnode-js-discovery-diffing-two-network-scans-to-flag-new-hosts\u002F":3},{"post":4,"newer":4056,"older":4067,"related":4076,"series":4104},{"id":5,"title":6,"body":7,"canonical":4036,"categories":4037,"date":4040,"description":4041,"extension":4042,"featured":4043,"hero":4044,"image":4044,"meta":4045,"navigation":494,"path":4046,"readingTime":144,"seo":4047,"series":4044,"seriesOrder":4044,"sites":4048,"source":4044,"stem":4049,"tags":4050,"updated":4044,"url":4054,"__hash__":4055},"blog\u002Fblog\u002F2026\u002F03\u002F11\u002Fnode-js-discovery-diffing-two-network-scans-to-flag-new-hosts.md","Node.js: Discovery – Diffing Two Network Scans to Flag New Hosts",{"type":8,"value":9,"toc":4029},"minimark",[10,19,28,33,69,73,88,166,169,187,195,198,222,225,408,412,3836,3840,3941,3945,4025],[11,12,13,14,18],"p",{},"A single network scan tells you what's out there today. It's the second scan, compared against the first, that tells you something changed: a rogue device showed up on a subnet it shouldn't be on, a host that was supposed to be decommissioned is still answering, or a service quietly opened a new port. I run a scheduled ",[15,16,17],"code",{},"nmap"," sweep against the office and datacenter subnets and keep the XML output from each run; this script diffs any two of those XML files and reports new hosts, hosts that dropped off, hosts that moved to a different IP, and hosts whose open-port set changed, without pulling in an XML parsing dependency.",[11,20,21,22,27],{},"It's the \"keep it current\" half of the ",[23,24,26],"a",{"href":25},"\u002F2026\u002F07\u002F15\u002Finfrastructure-a-discovery-first-approach-to-documenting-an-undocumented-network\u002F","discovery-first approach to documenting an undocumented network",": the first scan feeds the inventory, and every scan after that feeds a change report.",[29,30,32],"h2",{"id":31},"requirements","Requirements",[34,35,36,52,59,66],"ul",{},[37,38,39,40,43,44,47,48,51],"li",{},"A supported Node.js LTS release (22 or later). No ",[15,41,42],{},"npm install","; only the core ",[15,45,46],{},"fs"," and ",[15,49,50],{},"path"," modules.",[37,53,54,55,58],{},"nmap on the scanning host, run as root or Administrator if you want SYN scans (",[15,56,57],{},"-sS","), OS detection, and MAC addresses. Unprivileged nmap falls back to connect scans, and MAC addresses only appear in the XML for targets on the local Ethernet segment.",[37,60,61,62,65],{},"Two scans taken with the same profile and port range, so the diff is meaningful. Comparing a top-1000-ports scan against a full ",[15,63,64],{},"-p-"," scan reports a lot of \"new ports\" that are only new to the scan.",[37,67,68],{},"Written authorization for every range in the schedule.",[29,70,72],{"id":71},"usage","Usage",[11,74,75,76,79,80,83,84,87],{},"Take a baseline and a follow-up scan with an identical command. ",[15,77,78],{},"-oX"," writes XML; ",[15,81,82],{},"--top-ports 1000"," keeps a daily \u002F24 run short; ",[15,85,86],{},"--reason"," records why each port got its state, which helps when a diff looks wrong:",[89,90,95],"pre",{"className":91,"code":92,"language":93,"meta":94,"style":94},"language-bash shiki shiki-themes github-dark","sudo nmap -sS --top-ports 1000 -T4 --reason -oX baseline.xml 10.0.20.0\u002F24\n# ...next day...\nsudo nmap -sS --top-ports 1000 -T4 --reason -oX current.xml 10.0.20.0\u002F24\n","bash","",[15,96,97,135,142],{"__ignoreMap":94},[98,99,102,106,110,114,117,120,123,126,129,132],"span",{"class":100,"line":101},"line",1,[98,103,105],{"class":104},"svObZ","sudo",[98,107,109],{"class":108},"sU2Wk"," nmap",[98,111,113],{"class":112},"sDLfK"," -sS",[98,115,116],{"class":112}," --top-ports",[98,118,119],{"class":112}," 1000",[98,121,122],{"class":112}," -T4",[98,124,125],{"class":112}," --reason",[98,127,128],{"class":112}," -oX",[98,130,131],{"class":108}," baseline.xml",[98,133,134],{"class":108}," 10.0.20.0\u002F24\n",[98,136,138],{"class":100,"line":137},2,[98,139,141],{"class":140},"sAwPA","# ...next day...\n",[98,143,145,147,149,151,153,155,157,159,161,164],{"class":100,"line":144},3,[98,146,105],{"class":104},[98,148,109],{"class":108},[98,150,113],{"class":112},[98,152,116],{"class":112},[98,154,119],{"class":112},[98,156,122],{"class":112},[98,158,125],{"class":112},[98,160,128],{"class":112},[98,162,163],{"class":108}," current.xml",[98,165,134],{"class":108},[11,167,168],{},"Diff them and print a summary plus the JSON report:",[89,170,172],{"className":91,"code":171,"language":93,"meta":94,"style":94},"node diff-scans.js baseline.xml current.xml\n",[15,173,174],{"__ignoreMap":94},[98,175,176,179,182,184],{"class":100,"line":101},[98,177,178],{"class":104},"node",[98,180,181],{"class":108}," diff-scans.js",[98,183,131],{"class":108},[98,185,186],{"class":108}," current.xml\n",[89,188,193],{"className":189,"code":191,"language":192,"meta":94},[190],"language-text","Baseline: baseline.xml (Tue Mar 10 02:00:01 2026)  Current: current.xml (Wed Mar 11 02:00:01 2026)\nNew hosts: 1, removed: 1, moved: 1, port changes: 2\n\n  NEW      10.0.20.87   (unknown)            mac 3c:22:fb:4e:91:07  ports: tcp\u002F22, tcp\u002F5900\n  REMOVED  10.0.20.31   print-2f.corp.example.internal\n  MOVED    b8:ca:3a:6d:12:a5  10.0.20.44 -> 10.0.20.46\n  PORTS    10.0.20.10   +tcp\u002F8080 (http-proxy)\n  PORTS    10.0.20.12   -tcp\u002F3389 (ms-wbt-server)\n","text",[15,194,191],{"__ignoreMap":94},[11,196,197],{},"Write the report to a file for a scheduled job, and fail the job when anything new shows up:",[89,199,201],{"className":91,"code":200,"language":93,"meta":94,"style":94},"node diff-scans.js baseline.xml current.xml --output diff-report.json --fail-on-new\n",[15,202,203],{"__ignoreMap":94},[98,204,205,207,209,211,213,216,219],{"class":100,"line":101},[98,206,178],{"class":104},[98,208,181],{"class":108},[98,210,131],{"class":108},[98,212,163],{"class":108},[98,214,215],{"class":112}," --output",[98,217,218],{"class":108}," diff-report.json",[98,220,221],{"class":112}," --fail-on-new\n",[11,223,224],{},"A nightly wrapper that rotates the files (cron runs it as root):",[89,226,228],{"className":91,"code":227,"language":93,"meta":94,"style":94},"#!\u002Fusr\u002Fbin\u002Fenv bash\n# nightly-scan.sh: scan, diff against yesterday, keep a dated copy.\nset -euo pipefail\ncd \u002Fvar\u002Flib\u002Fnetscan\nTARGETS=\"10.0.20.0\u002F24 10.0.30.0\u002F24\"\nnmap -sS --top-ports 1000 -T4 --reason -oX current.xml $TARGETS\ncp current.xml \"archive\u002Fscan-$(date +%F).xml\"\nif [ -f baseline.xml ]; then\n    node \u002Fopt\u002Fnetscan\u002Fdiff-scans.js baseline.xml current.xml --output \"archive\u002Fdiff-$(date +%F).json\" --fail-on-new \\\n        || echo \"New hosts detected: see archive\u002Fdiff-$(date +%F).json\" | mail -s \"Network scan: new hosts\" netops@example.com\nfi\nmv current.xml baseline.xml\n",[15,229,230,235,240,251,260,274,296,313,331,360,391,397],{"__ignoreMap":94},[98,231,232],{"class":100,"line":101},[98,233,234],{"class":140},"#!\u002Fusr\u002Fbin\u002Fenv bash\n",[98,236,237],{"class":100,"line":137},[98,238,239],{"class":140},"# nightly-scan.sh: scan, diff against yesterday, keep a dated copy.\n",[98,241,242,245,248],{"class":100,"line":144},[98,243,244],{"class":112},"set",[98,246,247],{"class":112}," -euo",[98,249,250],{"class":108}," pipefail\n",[98,252,254,257],{"class":100,"line":253},4,[98,255,256],{"class":112},"cd",[98,258,259],{"class":108}," \u002Fvar\u002Flib\u002Fnetscan\n",[98,261,263,267,271],{"class":100,"line":262},5,[98,264,266],{"class":265},"s95oV","TARGETS",[98,268,270],{"class":269},"snl16","=",[98,272,273],{"class":108},"\"10.0.20.0\u002F24 10.0.30.0\u002F24\"\n",[98,275,277,279,281,283,285,287,289,291,293],{"class":100,"line":276},6,[98,278,17],{"class":104},[98,280,113],{"class":112},[98,282,116],{"class":112},[98,284,119],{"class":112},[98,286,122],{"class":112},[98,288,125],{"class":112},[98,290,128],{"class":112},[98,292,163],{"class":108},[98,294,295],{"class":265}," $TARGETS\n",[98,297,299,302,304,307,310],{"class":100,"line":298},7,[98,300,301],{"class":104},"cp",[98,303,163],{"class":108},[98,305,306],{"class":108}," \"archive\u002Fscan-$(",[98,308,309],{"class":104},"date",[98,311,312],{"class":108}," +%F).xml\"\n",[98,314,316,319,322,325,328],{"class":100,"line":315},8,[98,317,318],{"class":269},"if",[98,320,321],{"class":265}," [ ",[98,323,324],{"class":269},"-f",[98,326,327],{"class":265}," baseline.xml ]; ",[98,329,330],{"class":269},"then\n",[98,332,334,337,340,342,344,346,349,351,354,357],{"class":100,"line":333},9,[98,335,336],{"class":104},"    node",[98,338,339],{"class":108}," \u002Fopt\u002Fnetscan\u002Fdiff-scans.js",[98,341,131],{"class":108},[98,343,163],{"class":108},[98,345,215],{"class":112},[98,347,348],{"class":108}," \"archive\u002Fdiff-$(",[98,350,309],{"class":104},[98,352,353],{"class":108}," +%F).json\"",[98,355,356],{"class":112}," --fail-on-new",[98,358,359],{"class":112}," \\\n",[98,361,363,366,369,372,374,376,379,382,385,388],{"class":100,"line":362},10,[98,364,365],{"class":269},"        ||",[98,367,368],{"class":112}," echo",[98,370,371],{"class":108}," \"New hosts detected: see archive\u002Fdiff-$(",[98,373,309],{"class":104},[98,375,353],{"class":108},[98,377,378],{"class":269}," |",[98,380,381],{"class":104}," mail",[98,383,384],{"class":112}," -s",[98,386,387],{"class":108}," \"Network scan: new hosts\"",[98,389,390],{"class":108}," netops@example.com\n",[98,392,394],{"class":100,"line":393},11,[98,395,396],{"class":269},"fi\n",[98,398,400,403,405],{"class":100,"line":399},12,[98,401,402],{"class":104},"mv",[98,404,163],{"class":108},[98,406,407],{"class":108}," baseline.xml\n",[29,409,411],{"id":410},"script","Script",[89,413,417],{"className":414,"code":415,"language":416,"meta":94,"style":94},"language-javascript shiki shiki-themes github-dark","#!\u002Fusr\u002Fbin\u002Fenv node\n\u002F**\n * diff-scans.js\n *\n * Diff two nmap XML scans (nmap -oX output) and report hosts that appeared,\n * disappeared, moved to a new IP (same MAC), or changed their open ports.\n *\n * Reads: two nmap XML files given as CLI arguments.\n * Writes: a JSON report to stdout, or to --output if given.\n * Exit code: 2 when --fail-on-new is set and new hosts were found.\n *\n * Dependency-free: it parses the regular subset of nmap's XML it needs with\n * regular expressions. Point it at your own scan output, not untrusted XML.\n *\u002F\n\n'use strict';\n\nconst fs = require('fs');\nconst path = require('path');\n\nfunction parseArgs(argv) {\n  const args = { output: null, failOnNew: false, files: [] };\n  for (let i = 0; i \u003C argv.length; i += 1) {\n    const arg = argv[i];\n    if (arg === '--output') {\n      args.output = argv[i + 1];\n      i += 1;\n    } else if (arg === '--fail-on-new') {\n      args.failOnNew = true;\n    } else {\n      args.files.push(arg);\n    }\n  }\n  if (args.files.length !== 2) {\n    throw new Error('Usage: diff-scans.js \u003Cbaseline.xml> \u003Ccurrent.xml> [--output report.json] [--fail-on-new]');\n  }\n  return args;\n}\n\nfunction decode(value) {\n  return value\n    .replace(\u002F<\u002Fg, '\u003C').replace(\u002F>\u002Fg, '>')\n    .replace(\u002F"\u002Fg, '\"').replace(\u002F'\u002Fg, \"'\").replace(\u002F&\u002Fg, '&');\n}\n\nfunction attr(tag, name) {\n  const match = tag.match(new RegExp(`\\\\s${name}=\"([^\"]*)\"`));\n  return match ? decode(match[1]) : null;\n}\n\nfunction parseScan(xml) {\n  const runTag = (xml.match(\u002F\u003Cnmaprun\\s[^>]*>\u002F) || [''])[0];\n  const hosts = new Map();\n\n  \u002F\u002F \"\u003Chost \" or \"\u003Chost>\" only: nmap's DTD also allows \u003Chosthint> elements, which a\n  \u002F\u002F looser \u002F\u003Chost[\\s\\S]*?\u003C\\\u002Fhost>\u002F pattern would swallow along with the next host.\n  const hostBlocks = xml.match(\u002F\u003Chost[\\s>][\\s\\S]*?\u003C\\\u002Fhost>\u002Fg) || [];\n\n  for (const block of hostBlocks) {\n    const statusTag = (block.match(\u002F\u003Cstatus\\s[^>]*>\u002F) || [''])[0];\n    if (attr(statusTag, 'state') !== 'up') {\n      continue;\n    }\n\n    let ip = null;\n    let mac = null;\n    let vendor = null;\n    for (const addressTag of block.match(\u002F\u003Caddress\\s[^>]*>\u002Fg) || []) {\n      const type = attr(addressTag, 'addrtype');\n      if (type === 'mac') {\n        mac = attr(addressTag, 'addr').toLowerCase();\n        vendor = attr(addressTag, 'vendor');\n      } else if (!ip) {\n        ip = attr(addressTag, 'addr');\n      }\n    }\n    if (!ip) {\n      continue;\n    }\n\n    const hostnameTag = (block.match(\u002F\u003Chostname\\s[^>]*>\u002F) || [''])[0];\n    const openPorts = {};\n    for (const portBlock of block.match(\u002F\u003Cport\\s[^>]*>[\\s\\S]*?\u003C\\\u002Fport>\u002Fg) || []) {\n      const portTag = portBlock.match(\u002F\u003Cport\\s[^>]*>\u002F)[0];\n      const stateTag = (portBlock.match(\u002F\u003Cstate\\s[^>]*>\u002F) || [''])[0];\n      const serviceTag = (portBlock.match(\u002F\u003Cservice\\s[^>]*>\u002F) || [''])[0];\n      if (attr(stateTag, 'state') === 'open') {\n        openPorts[`${attr(portTag, 'protocol')}\u002F${attr(portTag, 'portid')}`] = attr(serviceTag, 'name') || '';\n      }\n    }\n\n    hosts.set(ip, { ip, hostname: attr(hostnameTag, 'name'), mac, vendor, openPorts });\n  }\n\n  return { started: attr(runTag, 'startstr'), hosts };\n}\n\nfunction diffScans(baseline, current) {\n  const newHosts = [];\n  const removedHosts = [];\n  const movedHosts = [];\n  const changedPorts = [];\n\n  const baselineByMac = new Map([...baseline.values()].filter((h) => h.mac).map((h) => [h.mac, h]));\n  const currentByMac = new Map([...current.values()].filter((h) => h.mac).map((h) => [h.mac, h]));\n  \u002F\u002F Current IP -> baseline host for moved hosts, so their ports get compared too.\n  const movedFrom = new Map();\n\n  for (const [ip, host] of current) {\n    if (baseline.has(ip)) {\n      continue;\n    }\n    const previous = host.mac ? baselineByMac.get(host.mac) : null;\n    if (previous && !current.has(previous.ip)) {\n      movedHosts.push({ mac: host.mac, from: previous.ip, to: ip, hostname: host.hostname });\n      movedFrom.set(ip, previous);\n    } else {\n      newHosts.push(host);\n    }\n  }\n\n  for (const [ip, host] of baseline) {\n    if (current.has(ip)) {\n      continue;\n    }\n    const moved = host.mac && currentByMac.has(host.mac) && !baseline.has(currentByMac.get(host.mac).ip);\n    if (!moved) {\n      removedHosts.push(host);\n    }\n  }\n\n  for (const [ip, currentHost] of current) {\n    const baselineHost = baseline.get(ip) || movedFrom.get(ip);\n    if (!baselineHost) {\n      continue;\n    }\n    const added = Object.keys(currentHost.openPorts).filter((p) => !(p in baselineHost.openPorts));\n    const dropped = Object.keys(baselineHost.openPorts).filter((p) => !(p in currentHost.openPorts));\n    if (added.length || dropped.length) {\n      changedPorts.push({\n        ip,\n        hostname: currentHost.hostname,\n        addedPorts: added.map((p) => ({ port: p, service: currentHost.openPorts[p] })),\n        droppedPorts: dropped.map((p) => ({ port: p, service: baselineHost.openPorts[p] })),\n      });\n    }\n  }\n\n  return { newHosts, removedHosts, movedHosts, changedPorts };\n}\n\nfunction printSummary(report) {\n  const { newHosts, removedHosts, movedHosts, changedPorts } = report;\n  console.error(`Baseline: ${report.baseline} (${report.baselineStarted})  Current: ${report.current} (${report.currentStarted})`);\n  console.error(`New hosts: ${newHosts.length}, removed: ${removedHosts.length}, moved: ${movedHosts.length}, port changes: ${changedPorts.length}\\n`);\n  for (const h of newHosts) {\n    const mac = h.mac ? `mac ${h.mac}` : '';\n    console.error(`  NEW      ${h.ip.padEnd(12)} ${(h.hostname || '(unknown)').padEnd(20)} ${mac}  ports: ${Object.keys(h.openPorts).join(', ') || 'none open'}`);\n  }\n  for (const h of removedHosts) {\n    console.error(`  REMOVED  ${h.ip.padEnd(12)} ${h.hostname || ''}`);\n  }\n  for (const m of movedHosts) {\n    console.error(`  MOVED    ${m.mac}  ${m.from} -> ${m.to}`);\n  }\n  for (const c of changedPorts) {\n    const parts = [\n      ...c.addedPorts.map((p) => `+${p.port} (${p.service})`),\n      ...c.droppedPorts.map((p) => `-${p.port} (${p.service})`),\n    ];\n    console.error(`  PORTS    ${c.ip.padEnd(12)} ${parts.join(' ')}`);\n  }\n}\n\nfunction main() {\n  const args = parseArgs(process.argv.slice(2));\n  const [baselinePath, currentPath] = args.files;\n\n  const baseline = parseScan(fs.readFileSync(path.resolve(baselinePath), 'utf8'));\n  const current = parseScan(fs.readFileSync(path.resolve(currentPath), 'utf8'));\n  const diff = diffScans(baseline.hosts, current.hosts);\n\n  const report = {\n    baseline: baselinePath,\n    baselineStarted: baseline.started,\n    current: currentPath,\n    currentStarted: current.started,\n    summary: {\n      newHosts: diff.newHosts.length,\n      removedHosts: diff.removedHosts.length,\n      movedHosts: diff.movedHosts.length,\n      hostsWithPortChanges: diff.changedPorts.length,\n    },\n    ...diff,\n  };\n\n  printSummary(report);\n  const output = JSON.stringify(report, null, 2);\n  if (args.output) {\n    fs.writeFileSync(args.output, output, 'utf8');\n    console.error(`\\nReport written to ${args.output}`);\n  } else {\n    console.log(output);\n  }\n\n  if (args.failOnNew && diff.newHosts.length > 0) {\n    process.exitCode = 2;\n  }\n}\n\nmain();\n","javascript",[15,418,419,424,429,434,439,444,449,453,458,463,468,472,477,483,489,496,505,510,534,553,558,576,602,644,658,675,694,706,727,740,750,762,768,774,793,812,817,826,832,837,852,860,913,978,983,988,1008,1051,1081,1086,1091,1106,1165,1183,1188,1194,1200,1248,1253,1271,1319,1345,1353,1358,1363,1378,1392,1406,1454,1475,1491,1513,1530,1548,1564,1570,1575,1586,1593,1598,1603,1650,1663,1720,1760,1808,1855,1878,1943,1948,1953,1958,1979,1984,1989,2008,2013,2018,2038,2050,2062,2074,2086,2091,2151,2200,2206,2222,2227,2254,2268,2275,2280,2310,2331,2342,2353,2362,2373,2378,2383,2388,2412,2424,2431,2436,2473,2485,2495,2500,2505,2510,2534,2562,2574,2581,2586,2626,2662,2682,2693,2699,2705,2724,2743,2749,2754,2759,2764,2772,2777,2782,2797,2831,2885,2940,2957,2991,3092,3097,3113,3156,3161,3178,3221,3226,3243,3256,3299,3338,3344,3393,3398,3403,3408,3419,3443,3465,3470,3502,3529,3544,3549,3561,3567,3573,3579,3585,3591,3602,3612,3622,3632,3638,3647,3653,3658,3667,3696,3704,3720,3748,3758,3769,3774,3779,3801,3813,3818,3823,3828],{"__ignoreMap":94},[98,420,421],{"class":100,"line":101},[98,422,423],{"class":140},"#!\u002Fusr\u002Fbin\u002Fenv node\n",[98,425,426],{"class":100,"line":137},[98,427,428],{"class":140},"\u002F**\n",[98,430,431],{"class":100,"line":144},[98,432,433],{"class":140}," * diff-scans.js\n",[98,435,436],{"class":100,"line":253},[98,437,438],{"class":140}," *\n",[98,440,441],{"class":100,"line":262},[98,442,443],{"class":140}," * Diff two nmap XML scans (nmap -oX output) and report hosts that appeared,\n",[98,445,446],{"class":100,"line":276},[98,447,448],{"class":140}," * disappeared, moved to a new IP (same MAC), or changed their open ports.\n",[98,450,451],{"class":100,"line":298},[98,452,438],{"class":140},[98,454,455],{"class":100,"line":315},[98,456,457],{"class":140}," * Reads: two nmap XML files given as CLI arguments.\n",[98,459,460],{"class":100,"line":333},[98,461,462],{"class":140}," * Writes: a JSON report to stdout, or to --output if given.\n",[98,464,465],{"class":100,"line":362},[98,466,467],{"class":140}," * Exit code: 2 when --fail-on-new is set and new hosts were found.\n",[98,469,470],{"class":100,"line":393},[98,471,438],{"class":140},[98,473,474],{"class":100,"line":399},[98,475,476],{"class":140}," * Dependency-free: it parses the regular subset of nmap's XML it needs with\n",[98,478,480],{"class":100,"line":479},13,[98,481,482],{"class":140}," * regular expressions. 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{\n",[98,3179,3181,3183,3185,3187,3190,3193,3195,3197,3200,3202,3204,3207,3210,3212,3214,3217,3219],{"class":100,"line":3180},164,[98,3182,2996],{"class":265},[98,3184,2839],{"class":104},[98,3186,527],{"class":265},[98,3188,3189],{"class":108},"`  MOVED    ${",[98,3191,3192],{"class":265},"m",[98,3194,2849],{"class":108},[98,3196,2981],{"class":265},[98,3198,3199],{"class":108},"}  ${",[98,3201,3192],{"class":265},[98,3203,2849],{"class":108},[98,3205,3206],{"class":265},"from",[98,3208,3209],{"class":108},"} -> ${",[98,3211,3192],{"class":265},[98,3213,2849],{"class":108},[98,3215,3216],{"class":265},"to",[98,3218,1920],{"class":108},[98,3220,533],{"class":265},[98,3222,3224],{"class":100,"line":3223},165,[98,3225,773],{"class":265},[98,3227,3229,3231,3233,3235,3238,3240],{"class":100,"line":3228},166,[98,3230,607],{"class":269},[98,3232,610],{"class":265},[98,3234,515],{"class":269},[98,3236,3237],{"class":112}," c",[98,3239,1267],{"class":269},[98,3241,3242],{"class":265}," 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   ];\n",[98,3345,3347,3349,3351,3353,3356,3359,3361,3363,3365,3367,3369,3371,3373,3375,3378,3380,3382,3384,3387,3389,3391],{"class":100,"line":3346},171,[98,3348,2996],{"class":265},[98,3350,2839],{"class":104},[98,3352,527],{"class":265},[98,3354,3355],{"class":108},"`  PORTS    ${",[98,3357,3358],{"class":265},"c",[98,3360,2849],{"class":108},[98,3362,2240],{"class":265},[98,3364,2849],{"class":108},[98,3366,3014],{"class":104},[98,3368,527],{"class":108},[98,3370,3019],{"class":112},[98,3372,1901],{"class":108},[98,3374,3024],{"class":108},[98,3376,3377],{"class":265},"parts",[98,3379,2849],{"class":108},[98,3381,3077],{"class":104},[98,3383,527],{"class":108},[98,3385,3386],{"class":108},"' 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...",[98,3645,3646],{"class":265},"diff,\n",[98,3648,3650],{"class":100,"line":3649},195,[98,3651,3652],{"class":265},"  };\n",[98,3654,3656],{"class":100,"line":3655},196,[98,3657,495],{"emptyLinePlaceholder":494},[98,3659,3661,3664],{"class":100,"line":3660},197,[98,3662,3663],{"class":104},"  printSummary",[98,3665,3666],{"class":265},"(report);\n",[98,3668,3670,3672,3675,3677,3680,3682,3685,3688,3690,3692,3694],{"class":100,"line":3669},198,[98,3671,581],{"class":269},[98,3673,3674],{"class":112}," output",[98,3676,521],{"class":269},[98,3678,3679],{"class":112}," JSON",[98,3681,2849],{"class":265},[98,3683,3684],{"class":104},"stringify",[98,3686,3687],{"class":265},"(report, ",[98,3689,592],{"class":112},[98,3691,885],{"class":265},[98,3693,3440],{"class":112},[98,3695,533],{"class":265},[98,3697,3699,3701],{"class":100,"line":3698},199,[98,3700,779],{"class":269},[98,3702,3703],{"class":265}," (args.output) 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",[98,3755,714],{"class":269},[98,3757,749],{"class":265},[98,3759,3761,3763,3766],{"class":100,"line":3760},203,[98,3762,2996],{"class":265},[98,3764,3765],{"class":104},"log",[98,3767,3768],{"class":265},"(output);\n",[98,3770,3772],{"class":100,"line":3771},204,[98,3773,773],{"class":265},[98,3775,3777],{"class":100,"line":3776},205,[98,3778,495],{"emptyLinePlaceholder":494},[98,3780,3782,3784,3787,3789,3792,3794,3797,3799],{"class":100,"line":3781},206,[98,3783,779],{"class":269},[98,3785,3786],{"class":265}," (args.failOnNew ",[98,3788,2320],{"class":269},[98,3790,3791],{"class":265}," diff.newHosts.",[98,3793,633],{"class":112},[98,3795,3796],{"class":269}," >",[98,3798,621],{"class":112},[98,3800,575],{"class":265},[98,3802,3804,3807,3809,3811],{"class":100,"line":3803},207,[98,3805,3806],{"class":265},"    process.exitCode ",[98,3808,270],{"class":269},[98,3810,790],{"class":112},[98,3812,504],{"class":265},[98,3814,3816],{"class":100,"line":3815},208,[98,3817,773],{"class":265},[98,3819,3821],{"class":100,"line":3820},209,[98,3822,831],{"class":265},[98,3824,3826],{"class":100,"line":3825},210,[98,3827,495],{"emptyLinePlaceholder":494},[98,3829,3831,3834],{"class":100,"line":3830},211,[98,3832,3833],{"class":104},"main",[98,3835,1182],{"class":265},[29,3837,3839],{"id":3838},"notes","Notes",[34,3841,3842,3871,3897,3903,3917,3931],{},[37,3843,3844,3851,3852,3854,3855,3858,3859,3862,3863,3865,3866,3868,3869,2849],{},[3845,3846,3847,3848,2849],"strong",{},"Bug fixed from the first version: ",[15,3849,3850],{},"\u003Chosthint>"," nmap's DTD allows ",[15,3853,3850],{}," elements (a status, address and hostnames block) as siblings of ",[15,3856,3857],{},"\u003Chost>",". The original ",[15,3860,3861],{},"\u002F\u003Chost[\\s\\S]*?\u003C\\\u002Fhost>\u002F"," pattern matched ",[15,3864,3850],{}," too, so one match could span a hint and the following real host and attribute the wrong ports to an address. The pattern now requires whitespace or ",[15,3867,1142],{}," after ",[15,3870,2245],{},[37,3872,3873,3876,3877,885,3880,885,3883,47,3886,3889,3890,3892,3893,3896],{},[3845,3874,3875],{},"Only up hosts count."," The DTD defines host states ",[15,3878,3879],{},"up",[15,3881,3882],{},"down",[15,3884,3885],{},"unknown",[15,3887,3888],{},"skipped",", and the first version counted any ",[15,3891,3857],{}," element as present. The script now checks ",[15,3894,3895],{},"\u003Cstatus state=\"up\">"," before counting a host.",[37,3898,3899,3902],{},[3845,3900,3901],{},"MAC-based \"moved\"."," On DHCP subnets a device that got a new lease shows up as one \"new\" and one \"removed\" host. When both scans include the MAC (root scan, local segment), the script pairs them, reports a move instead, and compares the moved host's ports against its old address. Across routers there's no MAC in the XML and the pairing doesn't happen.",[37,3904,3905,3908,3909,3912,3913,3916],{},[3845,3906,3907],{},"IPv6 works"," as long as both scans used ",[15,3910,3911],{},"-6"," against the same targets; the first non-MAC ",[15,3914,3915],{},"\u003Caddress>"," is used as the key.",[37,3918,3919,3922,3923,3926,3927,3930],{},[3845,3920,3921],{},"\"Removed\" is not \"gone\"."," A host missing from the current scan may just not have answered discovery probes that night. ",[15,3924,3925],{},"-T4"," already allows up to 6 retransmissions (",[15,3928,3929],{},"--max-retries 6","); if a host flaps every run, check it for power management or a host firewall that drops discovery probes before assuming it was decommissioned.",[37,3932,3933,3936,3937,3940],{},[3845,3934,3935],{},"Parsing trade-off."," Regex parsing keeps this dependency-free and works on nmap's own consistently formatted output. It is not a general XML parser; if you already have a dependency budget, an XML library is the more robust choice. The discovery-first essay uses Python's ",[15,3938,3939],{},"xml.etree.ElementTree"," for the same file.",[29,3942,3944],{"id":3943},"references","References",[34,3946,3947,3960,3982,3994,4008,4015],{},[37,3948,3949],{},[23,3950,3954,3955,885,3957,1901],{"href":3951,"rel":3952},"https:\u002F\u002Fnmap.org\u002Fbook\u002Fman-output.html",[3953],"nofollow","Nmap output options (",[15,3956,78],{},[15,3958,3959],{},"-oA",[37,3961,3962],{},[23,3963,3966,3967,885,3969,885,3972,885,3975,885,3978,885,3980,1901],{"href":3964,"rel":3965},"https:\u002F\u002Fsvn.nmap.org\u002Fnmap\u002Fdocs\u002Fnmap.dtd",[3953],"Nmap XML DTD (",[15,3968,2245],{},[15,3970,3971],{},"hosthint",[15,3973,3974],{},"status",[15,3976,3977],{},"address",[15,3979,3284],{},[15,3981,3293],{},[37,3983,3984],{},[23,3985,3988,3989,885,3991,1901],{"href":3986,"rel":3987},"https:\u002F\u002Fnmap.org\u002Fbook\u002Fman-performance.html",[3953],"Nmap timing and performance (",[15,3990,3925],{},[15,3992,3993],{},"--max-retries",[37,3995,3996],{},[23,3997,4000,4001,4003,4004,4007],{"href":3998,"rel":3999},"https:\u002F\u002Fnmap.org\u002Fbook\u002Fman-port-scanning-techniques.html",[3953],"Nmap port scanning techniques (",[15,4002,57],{}," privileges, ",[15,4005,4006],{},"-sT"," fallback)",[37,4009,4010],{},[23,4011,4014],{"href":4012,"rel":4013},"https:\u002F\u002Fnmap.org\u002Fbook\u002Fman-host-discovery.html",[3953],"Nmap host discovery (ARP on local Ethernet)",[37,4016,4017],{},[23,4018,4021,4022],{"href":4019,"rel":4020},"https:\u002F\u002Fnodejs.org\u002Fapi\u002Ffs.html#fsreadfilesyncpath-options",[3953],"Node.js ",[15,4023,4024],{},"fs.readFileSync",[4026,4027,4028],"style",{},"html pre.shiki code .svObZ, html code.shiki .svObZ{--shiki-default:#B392F0}html pre.shiki code .sU2Wk, html code.shiki .sU2Wk{--shiki-default:#9ECBFF}html pre.shiki code .sDLfK, html code.shiki .sDLfK{--shiki-default:#79B8FF}html pre.shiki code .sAwPA, html code.shiki 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