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Port 567 (banyan-rpc)

IANA assigns port 567 to banyan-rpc.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
banyan-rpc TCP banyan-rpc Tom Lemaire -
banyan-rpc UDP banyan-rpc Tom Lemaire -

Check what is listening on port 567

Linux: is anything listening on TCP 567?
sudo ss -tlnp 'sport = :567'
Linux: UDP 567
sudo ss -ulnp 'sport = :567'
Linux / macOS: which process owns the port
sudo lsof -nP -i :567
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':567 '
Windows (Command Prompt)
netstat -ano | findstr :567
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 567 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 567
From Windows
Test-NetConnection HOST -Port 567
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 567

Block port 567 in the firewall

ufw
sudo ufw deny 567/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 567 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 567 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 567' -Direction Inbound -Protocol TCP -LocalPort 567 -Action Block
ufw
sudo ufw deny 567/udp
iptables
sudo iptables -A INPUT -p udp --dport 567 -j DROP
nftables
sudo nft add rule inet filter input udp dport 567 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 567' -Direction Inbound -Protocol UDP -LocalPort 567 -Action Block

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