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// Other services

Port 1906: TPortMapperReq

Port 1906 is assigned by IANA to tpmd (TPortMapperReq).

1906

How tpmd works

Other services
client:1906tpmdresponse client:1906tpmdresponse

The client sends a request to port 1906 and the tpmd 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 1906 dangerous?

We have no specific security note for port 1906. 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 1906

ServicePortTransportDescriptionReferenceUpdated
tpmd 1906 TCP, UDP TPortMapperReq - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1906, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1906'      # process listening on 1906
sudo lsof -nP -i :1906

macOS

sudo lsof -nP -i :1906

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1906 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1906
netstat -ano | findstr :1906

From another machine

nmap -p 1906 -sV <host>
sudo nmap -sU -p 1906 <host>
nc -zv <host> 1906

Block it in the firewall

sudo ufw deny 1906/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1906" -Direction Inbound -LocalPort 1906 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1906 used for?

Port 1906 is assigned by IANA to tpmd (TPortMapperReq).

Is port 1906 TCP or UDP?

Port 1906 is registered for TCP and UDP.

Is it safe to open port 1906?

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 1906 is open?

On Linux run "ss -ltnup 'sport = :1906'", on macOS "lsof -nP -i :1906", and on Windows "netstat -ano | findstr :1906" to see the local process. From another machine, "nmap -p 1906 <host>" shows whether it is reachable.

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