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Port 1223 (tgp)

IANA assigns port 1223 to tgp: TrulyGlobal Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tgp TCP TrulyGlobal Protocol Gur Kimchi -
tgp UDP TrulyGlobal Protocol Gur Kimchi -

Registry dates for this port: registered 2008-05-20.

Check what is listening on port 1223

Linux: is anything listening on TCP 1223?
sudo ss -tlnp 'sport = :1223'
Linux: UDP 1223
sudo ss -ulnp 'sport = :1223'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1223
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1223 '
Windows (Command Prompt)
netstat -ano | findstr :1223
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1223 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1223
From Windows
Test-NetConnection HOST -Port 1223
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1223

Block port 1223 in the firewall

ufw
sudo ufw deny 1223/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1223 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1223 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1223' -Direction Inbound -Protocol TCP -LocalPort 1223 -Action Block
ufw
sudo ufw deny 1223/udp
iptables
sudo iptables -A INPUT -p udp --dport 1223 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1223 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1223' -Direction Inbound -Protocol UDP -LocalPort 1223 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.