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// Network services

Port 42508: Computer Associates network discovery protocol

Port 42508 is assigned by IANA to candp (Computer Associates network discovery protocol).

42508

How candp works

Network services
client:42508candpresponse client:42508candpresponse

The client sends a request to port 42508 and the candp 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 42508 dangerous?

We have no specific security note for port 42508. 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 42508

ServicePortTransportDescriptionReferenceUpdated
candp 42508 TCP, UDP Computer Associates network discovery protocol - 2005-09

// source: IANA service name and port number registry

03 Check it

Which program uses port 42508, and is it reachable?

Linux

sudo ss -ltnup 'sport = :42508'      # process listening on 42508
sudo lsof -nP -i :42508

macOS

sudo lsof -nP -i :42508

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 42508 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 42508
netstat -ano | findstr :42508

From another machine

nmap -p 42508 -sV <host>
sudo nmap -sU -p 42508 <host>
nc -zv <host> 42508

Block it in the firewall

sudo ufw deny 42508/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 42508" -Direction Inbound -LocalPort 42508 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 42508 used for?

Port 42508 is assigned by IANA to candp (Computer Associates network discovery protocol).

Is port 42508 TCP or UDP?

Port 42508 is registered for TCP and UDP.

Is it safe to open port 42508?

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 42508 is open?

On Linux run "ss -ltnup 'sport = :42508'", on macOS "lsof -nP -i :42508", and on Windows "netstat -ano | findstr :42508" to see the local process. From another machine, "nmap -p 42508 <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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