{
  "port": 3323,
  "protocol": "tcp",
  "service": "active-net (Active Networks)",
  "oneLiner": "Part of the 3322-3325 Active Networks block — a registration with no deployed protocol behind it.",
  "whatItIs": "Port 3323 falls inside IANA's `active-net` range 3322-3325, registered to Bob Braden for DARPA's Active Networks research. The block was reserved for experimental active-networking software; no RFC defines it and no widely used implementation claims it, so there is no wire format to describe. Every port in the range carries the same single registry line and nothing else. An open 3323 is therefore an unknown service wearing a borrowed name.",
  "exposure": {
    "verdict": "careful",
    "note": "Nothing standard should be here — identify the listener by its banner before deciding whether the port belongs open."
  },
  "checkCommand": "nc -vz TARGET 3323",
  "links": [
    {
      "title": "IANA Service Name and Transport Protocol Port Number Registry",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml",
      "kind": "iana"
    }
  ]
}