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Port 559 (teedtap)

IANA assigns port 559 to teedtap: TEEDTAP.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
teedtap TCP TEEDTAP Charlie Limoges -
teedtap UDP TEEDTAP Charlie Limoges -

Check what is listening on port 559

Linux: is anything listening on TCP 559?
sudo ss -tlnp 'sport = :559'
Linux: UDP 559
sudo ss -ulnp 'sport = :559'
Linux / macOS: which process owns the port
sudo lsof -nP -i :559
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':559 '
Windows (Command Prompt)
netstat -ano | findstr :559
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 559 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 559
From Windows
Test-NetConnection HOST -Port 559
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 559

Block port 559 in the firewall

ufw
sudo ufw deny 559/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 559 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 559 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 559' -Direction Inbound -Protocol TCP -LocalPort 559 -Action Block
ufw
sudo ufw deny 559/udp
iptables
sudo iptables -A INPUT -p udp --dport 559 -j DROP
nftables
sudo nft add rule inet filter input udp dport 559 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 559' -Direction Inbound -Protocol UDP -LocalPort 559 -Action Block

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