A 1990s IANA registration called "Bridge Control" with no public specification.
IANA lists 1073/tcp and 1073/udp as bridgecontrol, "Bridge Control", registered to Andy Heron. No protocol document, product page, or open implementation is publicly available, so there is nothing to fingerprint against. A listener you find here is far more likely to be an unrelated application that grabbed a low free port, or a Windows client socket from the old 1025-5000 dynamic range, than the registered protocol.
Expose with care
Identify what is actually listening before deciding — the registration tells you nothing about the service's authentication or encryption.
$ nmap -sV -Pn -p 1073 TARGETSeen 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.