Port 4604 (irp)

IANA assigns port 4604 to irp: Identity Registration Protocol.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

irp TCP Identity Registration Protocol Sixscape Communications Pte Ltd -

Registry dates for this port: registered 2014-03-17, last modified 2014-08-26.

Linux: is anything listening on TCP 4604?

sudo ss -tlnp 'sport = :4604'

Linux / macOS: which process owns the port

sudo lsof -nP -i :4604

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':4604 '

Windows (Command Prompt)

netstat -ano | findstr :4604

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4604 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 4604

From Windows

Test-NetConnection HOST -Port 4604

ufw

sudo ufw deny 4604/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 4604 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 4604 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 4604' -Direction Inbound -Protocol TCP -LocalPort 4604 -Action Block

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