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Port 4605 (sixchat)

IANA assigns port 4605 to sixchat: Direct End to End Secure Chat Protocol.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sixchat TCP Direct End to End Secure Chat Protocol Sixscape Communications Pte Ltd -

Registry dates for this port: registered 2014-09-11.

Check what is listening on port 4605

Linux: is anything listening on TCP 4605?
sudo ss -tlnp 'sport = :4605'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4605
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4605 '
Windows (Command Prompt)
netstat -ano | findstr :4605
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4605 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4605
From Windows
Test-NetConnection HOST -Port 4605

Block port 4605 in the firewall

ufw
sudo ufw deny 4605/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4605 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4605 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4605' -Direction Inbound -Protocol TCP -LocalPort 4605 -Action Block

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