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// Other services

Port 20167: TOLfab Data Change

Port 20167 is assigned by IANA to tolfab (TOLfab Data Change).

20167

How tolfab works

Other services
client:20167tolfabresponse client:20167tolfabresponse

The client sends a request to port 20167 and the tolfab 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 20167 dangerous?

We have no specific security note for port 20167. 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 20167

ServicePortTransportDescriptionReferenceUpdated
tolfab 20167 TCP, UDP TOLfab Data Change - 2006-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 20167, and is it reachable?

Linux

sudo ss -ltnup 'sport = :20167'      # process listening on 20167
sudo lsof -nP -i :20167

macOS

sudo lsof -nP -i :20167

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 20167 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 20167
netstat -ano | findstr :20167

From another machine

nmap -p 20167 -sV <host>
sudo nmap -sU -p 20167 <host>
nc -zv <host> 20167

Block it in the firewall

sudo ufw deny 20167/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 20167" -Direction Inbound -LocalPort 20167 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 20167 used for?

Port 20167 is assigned by IANA to tolfab (TOLfab Data Change).

Is port 20167 TCP or UDP?

Port 20167 is registered for TCP and UDP.

Is it safe to open port 20167?

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 20167 is open?

On Linux run "ss -ltnup 'sport = :20167'", on macOS "lsof -nP -i :20167", and on Windows "netstat -ano | findstr :20167" to see the local process. From another machine, "nmap -p 20167 <host>" shows whether it is reachable.

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