An unexplained IANA registration — "tn-tl-r1" on TCP, "tn-tl-r2" on UDP, with no public protocol behind either.
IANA lists 1580/tcp as "tn-tl-r1" and 1580/udp as "tn-tl-r2", registered by Ed Kress. The registry gives no expansion of the name, there is no published specification, and no widely deployed software claims the port. This is one of the many mid-1990s vendor assignments that outlived the product that requested it.
Expose with care
Nothing common listens here, so an open 1580 is an unidentified process — identify it locally before reasoning about whether it should be reachable.
$ nc -vz -w 3 TARGET 1580Seen 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.
Get Beige Box →also available as JSON · Markdown
Corrections or a missing port? Reply @rimrocksystems.