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Port 573 (banyan-vip)

IANA assigns port 573 to banyan-vip.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
banyan-vip TCP banyan-vip Denis Leclerc -
banyan-vip UDP banyan-vip Denis Leclerc -

Check what is listening on port 573

Linux: is anything listening on TCP 573?
sudo ss -tlnp 'sport = :573'
Linux: UDP 573
sudo ss -ulnp 'sport = :573'
Linux / macOS: which process owns the port
sudo lsof -nP -i :573
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':573 '
Windows (Command Prompt)
netstat -ano | findstr :573
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 573 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 573
From Windows
Test-NetConnection HOST -Port 573
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 573

Block port 573 in the firewall

ufw
sudo ufw deny 573/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 573 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 573 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 573' -Direction Inbound -Protocol TCP -LocalPort 573 -Action Block
ufw
sudo ufw deny 573/udp
iptables
sudo iptables -A INPUT -p udp --dport 573 -j DROP
nftables
sudo nft add rule inet filter input udp dport 573 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 573' -Direction Inbound -Protocol UDP -LocalPort 573 -Action Block

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