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Port 566 (streettalk)

IANA assigns port 566 to streettalk.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
streettalk TCP streettalk - -
streettalk UDP streettalk - -

Check what is listening on port 566

Linux: is anything listening on TCP 566?
sudo ss -tlnp 'sport = :566'
Linux: UDP 566
sudo ss -ulnp 'sport = :566'
Linux / macOS: which process owns the port
sudo lsof -nP -i :566
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':566 '
Windows (Command Prompt)
netstat -ano | findstr :566
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 566 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 566
From Windows
Test-NetConnection HOST -Port 566
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 566

Block port 566 in the firewall

ufw
sudo ufw deny 566/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 566 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 566 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 566' -Direction Inbound -Protocol TCP -LocalPort 566 -Action Block
ufw
sudo ufw deny 566/udp
iptables
sudo iptables -A INPUT -p udp --dport 566 -j DROP
nftables
sudo nft add rule inet filter input udp dport 566 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 566' -Direction Inbound -Protocol UDP -LocalPort 566 -Action Block

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