# WHATPORT(444)

## NAME

port 444 — SNPP (Simple Network Paging Protocol) — The registered home of pager messaging — but in practice usually an alternate HTTPS or admin port.

Protocol: TCP  
IANA: snpp

## DESCRIPTION

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

**Expose with care.** 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.

## CHECK

```sh
printf 'QUIT\r\n' | nc -v -w 5 TARGET 444
```

## SEE ALSO

- spec — [RFC 1861 — Simple Network Paging Protocol Version 3](https://www.rfc-editor.org/rfc/rfc1861.html) (rfc-editor.org)
- iana — [IANA Service Name and Transport Protocol Port Number Registry — 444](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=444) (iana.org)

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HTML: <https://whatport.net/444/> · JSON: <https://whatport.net/444.json> · full dataset: <https://whatport.net/ports.json>