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Port 4606 (sixid)

IANA assigns port 4606 to sixid: Secure ID to IP registration and lookup.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sixid TCP Secure ID to IP registration and lookup Sixscape Communications Pte Ltd -

Registry dates for this port: registered 2020-04-28.

Check what is listening on port 4606

Linux: is anything listening on TCP 4606?
sudo ss -tlnp 'sport = :4606'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4606
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4606 '
Windows (Command Prompt)
netstat -ano | findstr :4606
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4606 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4606
From Windows
Test-NetConnection HOST -Port 4606

Block port 4606 in the firewall

ufw
sudo ufw deny 4606/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4606 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4606 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4606' -Direction Inbound -Protocol TCP -LocalPort 4606 -Action Block

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