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// Other services

Port 559: TEEDTAP

Port 559 is assigned by IANA to teedtap (TEEDTAP).

559

How teedtap works

Other services
client:559teedtapresponse client:559teedtapresponse

The client sends a request to port 559 and the teedtap service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 559 dangerous?

We have no specific security note for port 559. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 559

ServicePortTransportDescriptionReferenceUpdated
teedtap 559 TCP, UDP TEEDTAP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 559, and is it reachable?

Linux

sudo ss -ltnup 'sport = :559'      # process listening on 559
sudo lsof -nP -i :559

macOS

sudo lsof -nP -i :559

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 559 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 559
netstat -ano | findstr :559

From another machine

nmap -p 559 -sV <host>
sudo nmap -sU -p 559 <host>
nc -zv <host> 559

Block it in the firewall

sudo ufw deny 559/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 559" -Direction Inbound -LocalPort 559 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 559 used for?

Port 559 is assigned by IANA to teedtap (TEEDTAP).

Is port 559 TCP or UDP?

Port 559 is registered for TCP and UDP.

Is it safe to open port 559?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 559 is open?

On Linux run "ss -ltnup 'sport = :559'", on macOS "lsof -nP -i :559", and on Windows "netstat -ano | findstr :559" to see the local process. From another machine, "nmap -p 559 <host>" shows whether it is reachable.

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