The registered home of pager messaging — but in practice usually an alternate HTTPS or admin port.
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.
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.
$ printf 'QUIT\r\n' | nc -v -w 5 TARGET 444Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.