Unassigned today; historically part of RSA ACE/Server's replica synchronisation block.
IANA lists 5508-5539 as unassigned, so 5510 has no current registration. Its historical use comes from RSA ACE/Server (later Authentication Manager), whose shipped services file allocated securidprop_00 through securidprop_10 across 5505-5515 for server-to-replica synchronisation, with 5510 serving replica 5. Outside a legacy SecurID deployment, an open 5510 is some application's own choice of port.
Do not expose
If this is SecurID replication, it is authentication-infrastructure traffic between servers and belongs on an internal segment only.
$ sudo lsof -nP -iTCP:5510 -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.