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Port 2223 (rockwell-csp2)

IANA assigns port 2223 to rockwell-csp2: Rockwell CSP2.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rockwell-csp2 TCP Rockwell CSP2 Brian Batke -
rockwell-csp2 UDP Rockwell CSP2 Brian Batke -

Check what is listening on port 2223

Linux: is anything listening on TCP 2223?
sudo ss -tlnp 'sport = :2223'
Linux: UDP 2223
sudo ss -ulnp 'sport = :2223'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2223
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2223 '
Windows (Command Prompt)
netstat -ano | findstr :2223
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2223 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2223
From Windows
Test-NetConnection HOST -Port 2223
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2223

Block port 2223 in the firewall

ufw
sudo ufw deny 2223/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2223 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2223 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2223' -Direction Inbound -Protocol TCP -LocalPort 2223 -Action Block
ufw
sudo ufw deny 2223/udp
iptables
sudo iptables -A INPUT -p udp --dport 2223 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2223 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2223' -Direction Inbound -Protocol UDP -LocalPort 2223 -Action Block

Related ports

2221ethernet-ip-s2222SSH alternate2224efi-mg2225rcip-itu

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