{
  "port": 4550,
  "protocol": "tcp",
  "service": "gds-adppiw-db (IANA registration)",
  "oneLiner": "An obscure InterBase-related database registration; almost never seen in the wild.",
  "whatItIs": "IANA registers 4550 as gds-adppiw-db, described as Perman I Interbase Server — a vendor-specific database listener from the InterBase family, registered by Leo Lesage. Standard InterBase and Firebird use 3050, not 4550, and no current product documents this port. Treat an open 4550 as an unidentified database or application listener until proven otherwise.",
  "exposure": {
    "verdict": "never",
    "note": "Everything the registration points at is a database server, and database ports do not belong on the public internet regardless of vendor."
  },
  "checkCommand": "nc -vz -w 3 TARGET 4550",
  "links": [
    {
      "title": "IANA port registry — 4550 (gds-adppiw-db)",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=4550",
      "kind": "iana"
    }
  ]
}