{
  "port": 5730,
  "protocol": "tcp",
  "service": "unieng (Steltor calendar access)",
  "oneLiner": "An old calendar-server registration; nothing in current use listens here.",
  "whatItIs": "IANA assigns 5730 to unieng, described in the registry as \"Steltor's calendar access\". Steltor was a calendar-software vendor and the registration dates from that product's lifetime; no widely deployed software uses this port today. An open 5730 in 2026 is an application that chose the number for itself, not the registered service, so confirm it by process.",
  "exposure": {
    "verdict": "careful",
    "note": "An unidentified listener on a port with a defunct registration. Establish what owns it before allowing anything to reach it."
  },
  "checkCommand": "sudo lsof -nP -iTCP:5730 -sTCP:LISTEN",
  "links": [
    {
      "title": "IANA port registry — 5730 (unieng)",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=5730",
      "kind": "iana"
    }
  ]
}