{
  "port": 6504,
  "protocol": "tcp",
  "service": "Unassigned",
  "oneLiner": "Unassigned by IANA, immediately above the registered BoKS block.",
  "whatItIs": "The registry shows 6504 as unassigned. Its only context is the neighbourhood: 6500-6503 carry the BoKS access-control daemons, and a BoKS domain configured with a base port a few numbers higher would land traffic here. Nothing is registered or documented as owning 6504 itself, so a listener is either a shifted BoKS block or unrelated software that grabbed a free port.",
  "exposure": {
    "verdict": "careful",
    "note": "No registration to reason from — identify the process first. If it turns out to be a BoKS daemon, treat it as a control plane and keep it internal."
  },
  "checkCommand": "sudo lsof -nP -iTCP:6504 -sTCP:LISTEN",
  "links": [
    {
      "title": "IANA Service Name and Transport Protocol Port Number Registry — 6504 unassigned",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=6504",
      "kind": "iana"
    }
  ]
}