Registered to the Locus PC-Interface net map server; a dead 1980s product.
IANA lists port 125 as locus-map, the Locus PC-Interface Net Map Server, from Locus Computing's PC-Interface product that let DOS PCs use Unix file and print services. The company and the product are long gone and no specification was published. The registration persists in /etc/services, so scanners print the name without evidence. Anything listening on 125 today is unrelated to Locus.
Expose with care
The service name is a fossil; identify the actual listener before making any exposure decision.
$ nc -vz TARGET 125Seen 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.