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// Other services

Port 20202: IPD Tunneling Port

Port 20202 is assigned by IANA to ipdtp-port (IPD Tunneling Port).

20202

How ipdtp-port works

Other services
client:20202ipdtp-portresponse client:20202ipdtp-portresponse

The client sends a request to port 20202 and the ipdtp-port 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
Registered (1024-49151)
Category
Other services
01 Security

Is port 20202 dangerous?

We have no specific security note for port 20202. 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 20202

ServicePortTransportDescriptionReferenceUpdated
ipdtp-port 20202 TCP, UDP IPD Tunneling Port - 2003-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 20202, and is it reachable?

Linux

sudo ss -ltnup 'sport = :20202'      # process listening on 20202
sudo lsof -nP -i :20202

macOS

sudo lsof -nP -i :20202

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 20202 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 20202
netstat -ano | findstr :20202

From another machine

nmap -p 20202 -sV <host>
sudo nmap -sU -p 20202 <host>
nc -zv <host> 20202

Block it in the firewall

sudo ufw deny 20202/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 20202" -Direction Inbound -LocalPort 20202 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 20202 used for?

Port 20202 is assigned by IANA to ipdtp-port (IPD Tunneling Port).

Is port 20202 TCP or UDP?

Port 20202 is registered for TCP and UDP.

Is it safe to open port 20202?

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 20202 is open?

On Linux run "ss -ltnup 'sport = :20202'", on macOS "lsof -nP -i :20202", and on Windows "netstat -ano | findstr :20202" to see the local process. From another machine, "nmap -p 20202 <host>" shows whether it is reachable.

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