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// Network services

Port 42510: CA eTrust RPC

Port 42510 is assigned by IANA to caerpc (CA eTrust RPC).

42510

How caerpc works

Network services
client:42510caerpcresponse client:42510caerpcresponse

The client sends a request to port 42510 and the caerpc service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Network services
01 Security

Is port 42510 dangerous?

We have no specific security note for port 42510. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 42510

ServicePortTransportDescriptionReferenceUpdated
caerpc 42510 TCP, UDP CA eTrust RPC - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 42510, and is it reachable?

Linux

sudo ss -ltnup 'sport = :42510'      # process listening on 42510
sudo lsof -nP -i :42510

macOS

sudo lsof -nP -i :42510

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 42510 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 42510
netstat -ano | findstr :42510

From another machine

nmap -p 42510 -sV <host>
sudo nmap -sU -p 42510 <host>
nc -zv <host> 42510

Block it in the firewall

sudo ufw deny 42510/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 42510" -Direction Inbound -LocalPort 42510 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 42510 used for?

Port 42510 is assigned by IANA to caerpc (CA eTrust RPC).

Is port 42510 TCP or UDP?

Port 42510 is registered for TCP and UDP.

Is it safe to open port 42510?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 42510 is open?

On Linux run "ss -ltnup 'sport = :42510'", on macOS "lsof -nP -i :42510", and on Windows "netstat -ano | findstr :42510" to see the local process. From another machine, "nmap -p 42510 <host>" shows whether it is reachable.

05 Related
:53 DNS tcp · udp · moderate risk :135 MS RPC tcp · udp · high risk :123 NTP udp · tcp · moderate risk :67 DHCP server udp · tcp · moderate risk :111 rpcbind tcp · udp · high risk :9100 Raw printing (JetDirect) tcp · udp · high risk :631 IPP / CUPS tcp · udp · high risk :5353 mDNS udp · tcp · moderate risk

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