{
  "port": 6100,
  "protocol": "both",
  "service": "SynchroNet-db",
  "oneLiner": "Registered to SynchroNet-db; rarely seen in the wild.",
  "whatItIs": "IANA lists 6100 TCP and UDP as synchronet-db, \"SynchroNet-db\", registered to Arne Haugland, and the same entry is copied into the /etc/services file on most Unix systems. There is no public protocol specification and no widely deployed open-source implementation, so a scanner labelling 6100 as \"SynchroNet-db\" is reading the registry, not fingerprinting the service. If you find it listening, identify the process on the host rather than trusting the name — this is a plausible port for an in-house or vendor application to squat on.",
  "exposure": {
    "verdict": "careful",
    "note": "You cannot make a defensible call on a port whose actual occupant is unidentified; find the process, then decide. Treat an unknown listener on a public interface as something to close until it is explained."
  },
  "checkCommand": "sudo lsof -nP -iTCP:6100 -sTCP:LISTEN",
  "links": [
    {
      "title": "IANA Service Name and Transport Protocol Port Number Registry — 6100 (synchronet-db)",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=6100",
      "kind": "iana"
    }
  ]
}