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Port 576 (ipcd)

IANA assigns port 576 to ipcd.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
ipcd TCP ipcd - -
ipcd UDP ipcd - -

Check what is listening on port 576

Linux: is anything listening on TCP 576?
sudo ss -tlnp 'sport = :576'
Linux: UDP 576
sudo ss -ulnp 'sport = :576'
Linux / macOS: which process owns the port
sudo lsof -nP -i :576
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':576 '
Windows (Command Prompt)
netstat -ano | findstr :576
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 576 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 576
From Windows
Test-NetConnection HOST -Port 576
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 576

Block port 576 in the firewall

ufw
sudo ufw deny 576/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 576 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 576 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 576' -Direction Inbound -Protocol TCP -LocalPort 576 -Action Block
ufw
sudo ufw deny 576/udp
iptables
sudo iptables -A INPUT -p udp --dport 576 -j DROP
nftables
sudo nft add rule inet filter input udp dport 576 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 576' -Direction Inbound -Protocol UDP -LocalPort 576 -Action Block

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