{
  "port": 444,
  "protocol": "tcp",
  "service": "SNPP (Simple Network Paging Protocol)",
  "oneLiner": "The registered home of pager messaging — but in practice usually an alternate HTTPS or admin port.",
  "whatItIs": "SNPP (RFC 1861) is a plain-text, SMTP-shaped protocol for delivering messages to pagers: connect, PAGE the recipient ID, MESS the text, SEND. Paging carriers ran it into the 2000s and a few emergency-notification systems still do. Far more often, though, an open 444 is something else entirely — administrators reach for it as a spare HTTPS or management port because it sits just past 443 and is easy to remember. Check whether it speaks TLS before assuming SNPP.",
  "exposure": {
    "verdict": "careful",
    "note": "SNPP itself is unencrypted and historically accepted messages without authentication; if the listener is really an admin web UI on 444, judge it as you would any exposed management plane."
  },
  "checkCommand": "printf 'QUIT\\r\\n' | nc -v -w 5 TARGET 444",
  "links": [
    {
      "title": "RFC 1861 — Simple Network Paging Protocol Version 3",
      "url": "https://www.rfc-editor.org/rfc/rfc1861.html",
      "kind": "spec"
    },
    {
      "title": "IANA Service Name and Transport Protocol Port Number Registry — 444",
      "url": "https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=444",
      "kind": "iana"
    }
  ],
  "ianaName": "snpp"
}