# WHATPORT(42510)

## NAME

port 42510 — CA eTrust RPC (caerpc) — Registered in 2005 as caerpc, the RPC channel for Computer Associates' eTrust security products.

Protocol: TCP/UDP  
IANA registry

## DESCRIPTION

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.

## EXPOSURE

**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.

## CHECK

```sh
nmap -sV -Pn -p 42510 TARGET
```

## SEE ALSO

- iana — [IANA Service Name and Transport Protocol Port Number Registry — 42510 (caerpc, CA eTrust RPC)](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=42510) (iana.org)
- source — [nmap/nmap — nmap-services (42510 caerpc)](https://github.com/nmap/nmap/blob/master/nmap-services) (github.com)

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