{
  "port": 17877,
  "protocol": "tcp",
  "service": "Unassigned",
  "oneLiner": "Unregistered with no documented service; it is in Nmap's default scan set on frequency data alone.",
  "whatItIs": "IANA has no assignment for 17877 and Nmap carries no name for it, yet it ranks inside Nmap's default top-1000 TCP ports because scans encounter it open. No mainstream product documents it as a default listener, and nearby ports in the 17870-17890 range are unassigned as well. An open 17877 tells you a process chose that number, nothing more.",
  "exposure": {
    "verdict": "careful",
    "note": "Unknown service, so no defensible verdict from the port alone. Version-scan it and attribute it to a process before deciding whether it should be reachable."
  },
  "checkCommand": "nmap -Pn -sV -p 17877 TARGET",
  "links": [
    {
      "title": "IANA Service Name and Transport Protocol Port Number Registry",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml",
      "kind": "iana"
    },
    {
      "title": "Nmap services frequency database",
      "url": "https://github.com/nmap/nmap/blob/master/nmap-services",
      "kind": "github"
    }
  ]
}