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Port 5065 (ca-2)

IANA assigns port 5065 to ca-2: Channel Access 2.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ca-2 TCP Channel Access 2 Jeffrey Hill -
ca-2 UDP Channel Access 2 Jeffrey Hill -

Registry dates for this port: registered 2002-08.

Check what is listening on port 5065

Linux: is anything listening on TCP 5065?
sudo ss -tlnp 'sport = :5065'
Linux: UDP 5065
sudo ss -ulnp 'sport = :5065'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5065
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5065 '
Windows (Command Prompt)
netstat -ano | findstr :5065
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5065 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5065
From Windows
Test-NetConnection HOST -Port 5065
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5065

Block port 5065 in the firewall

ufw
sudo ufw deny 5065/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5065 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5065 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5065' -Direction Inbound -Protocol TCP -LocalPort 5065 -Action Block
ufw
sudo ufw deny 5065/udp
iptables
sudo iptables -A INPUT -p udp --dport 5065 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5065 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5065' -Direction Inbound -Protocol UDP -LocalPort 5065 -Action Block

Related ports

5063csrpc5064ca-15066stanag-50665067authentx

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