Unregistered, but the digits spell "8080 with a 4 in front" — usually someone's second HTTP port.
There is no IANA assignment for 48080 and no service name in Nmap's database, which sees it open on about 0.04% of hosts. The number is a hand-picked variant of 8080, so an open port here is most often an extra HTTP listener — a second app server, a proxy, or a management UI moved off the obvious port. Port obscurity is not access control: a version scan finds it in seconds.
Expose with care
Judge it as the HTTP service it usually is — cleartext with an admin UI behind it should not face the internet; a plain reverse-proxied app on TLS elsewhere is a different matter.
$ curl -sS -I -m 5 http://TARGET:48080/Seen 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.