Port 600 (ipcserver)

IANA assigns port 600 to ipcserver: Sun IPC server.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

ipcserver TCP Sun IPC server Bill Schiefelbein -

ipcserver UDP Sun IPC server Bill Schiefelbein -

Linux: is anything listening on TCP 600?

sudo ss -tlnp 'sport = :600'

Linux: UDP 600

sudo ss -ulnp 'sport = :600'

Linux / macOS: which process owns the port

sudo lsof -nP -i :600

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':600 '

Windows (Command Prompt)

netstat -ano | findstr :600

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 600 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 600

From Windows

Test-NetConnection HOST -Port 600

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 600

ufw

sudo ufw deny 600/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 600 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 600 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 600' -Direction Inbound -Protocol TCP -LocalPort 600 -Action Block

ufw

sudo ufw deny 600/udp

iptables

sudo iptables -A INPUT -p udp --dport 600 -j DROP

nftables

sudo nft add rule inet filter input udp dport 600 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 600' -Direction Inbound -Protocol UDP -LocalPort 600 -Action Block

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