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Port 42508 (candp)

IANA assigns port 42508 to candp: Computer Associates network discovery protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
candp TCP Computer Associates network discovery protocol Jon Press -
candp UDP Computer Associates network discovery protocol Jon Press -

Registry dates for this port: registered 2005-09.

Check what is listening on port 42508

Linux: is anything listening on TCP 42508?
sudo ss -tlnp 'sport = :42508'
Linux: UDP 42508
sudo ss -ulnp 'sport = :42508'
Linux / macOS: which process owns the port
sudo lsof -nP -i :42508
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':42508 '
Windows (Command Prompt)
netstat -ano | findstr :42508
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 42508 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 42508
From Windows
Test-NetConnection HOST -Port 42508
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 42508

Block port 42508 in the firewall

ufw
sudo ufw deny 42508/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 42508 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 42508 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 42508' -Direction Inbound -Protocol TCP -LocalPort 42508 -Action Block
ufw
sudo ufw deny 42508/udp
iptables
sudo iptables -A INPUT -p udp --dport 42508 -j DROP
nftables
sudo nft add rule inet filter input udp dport 42508 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 42508' -Direction Inbound -Protocol UDP -LocalPort 42508 -Action Block

Related ports

41796crestron-cips41797crestron-ctps42509candrp42510caerpc

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