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Port 42510 (caerpc)

IANA assigns port 42510 to caerpc: CA eTrust RPC.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
caerpc TCP CA eTrust RPC Jon Press -
caerpc UDP CA eTrust RPC Jon Press -

Registry dates for this port: registered 2005-08.

Check what is listening on port 42510

Linux: is anything listening on TCP 42510?
sudo ss -tlnp 'sport = :42510'
Linux: UDP 42510
sudo ss -ulnp 'sport = :42510'
Linux / macOS: which process owns the port
sudo lsof -nP -i :42510
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':42510 '
Windows (Command Prompt)
netstat -ano | findstr :42510
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 42510 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 42510
From Windows
Test-NetConnection HOST -Port 42510
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 42510

Block port 42510 in the firewall

ufw
sudo ufw deny 42510/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 42510 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 42510 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 42510' -Direction Inbound -Protocol TCP -LocalPort 42510 -Action Block
ufw
sudo ufw deny 42510/udp
iptables
sudo iptables -A INPUT -p udp --dport 42510 -j DROP
nftables
sudo nft add rule inet filter input udp dport 42510 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 42510' -Direction Inbound -Protocol UDP -LocalPort 42510 -Action Block

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.