No IANA assignment on either transport, and no documented default service.
8701 is absent from the IANA registry for both TCP and UDP. Nmap lists it as "unknown", open on roughly 0.08% of scanned TCP hosts and 0.03% of UDP hosts — low, but a little higher than most of its unregistered neighbours, which usually means a handful of products picked it independently rather than one well-known service. Nothing mainstream documents it as a default.
Expose with care
An unlabelled port with no registry meaning. Find the owning process and judge exposure on that, not on the number.
$ sudo lsof -nP -iTCP:8701 -sTCP:LISTENSeen 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.