{
  "port": 5510,
  "protocol": "tcp",
  "service": "Legacy RSA ACE/Server replica sync (unassigned at IANA)",
  "oneLiner": "Unassigned today; historically part of RSA ACE/Server's replica synchronisation block.",
  "whatItIs": "IANA lists 5508-5539 as unassigned, so 5510 has no current registration. Its historical use comes from RSA ACE/Server (later Authentication Manager), whose shipped services file allocated securidprop_00 through securidprop_10 across 5505-5515 for server-to-replica synchronisation, with 5510 serving replica 5. Outside a legacy SecurID deployment, an open 5510 is some application's own choice of port.",
  "exposure": {
    "verdict": "never",
    "note": "If this is SecurID replication, it is authentication-infrastructure traffic between servers and belongs on an internal segment only."
  },
  "checkCommand": "sudo lsof -nP -iTCP:5510 -sTCP:LISTEN",
  "links": [
    {
      "title": "RSA — annotated example of the ACE/Server services file",
      "url": "https://community.rsa.com/t5/securid-knowledge-base/correct-and-annotated-example-of-rsa-ace-server-services-file/ta-p/8600",
      "kind": "official-docs"
    },
    {
      "title": "IANA port registry — 5510 (unassigned)",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=5510",
      "kind": "iana"
    }
  ]
}