Registered in 2005 as caerpc, the RPC channel for Computer Associates' eTrust security products.
42510 is one of the few ports in this range with a real IANA assignment: caerpc, "CA eTrust RPC", registered on both TCP and UDP in August 2005 by Computer Associates. eTrust was CA's security product line — antivirus and access control — and the port carried its RPC management traffic between agents and servers. That branding is long retired (CA became part of Broadcom), so a modern open 42510 is more often an unrelated listener or an ephemeral socket than a genuine eTrust deployment; Nmap still sees it open on about 0.1% of hosts.
Do not expose
An RPC control channel for security agents is a management plane — keep it inside the management network, and if the software is genuinely still running, treat its age as the bigger problem.
$ nmap -sV -Pn -p 42510 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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