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// Other services

Port 20046: TMOP HL7 Message Transfer Service

Port 20046 is assigned by IANA to tmophl7mts (TMOP HL7 Message Transfer Service).

20046

How tmophl7mts works

Other services
client:20046tmophl7mtsresponse client:20046tmophl7mtsresponse

The client sends a request to port 20046 and the tmophl7mts 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 20046 dangerous?

We have no specific security note for port 20046. 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 20046

ServicePortTransportDescriptionReferenceUpdated
tmophl7mts 20046 TCP, UDP TMOP HL7 Message Transfer Service - 2009-07-31

// source: IANA service name and port number registry

03 Check it

Which program uses port 20046, and is it reachable?

Linux

sudo ss -ltnup 'sport = :20046'      # process listening on 20046
sudo lsof -nP -i :20046

macOS

sudo lsof -nP -i :20046

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 20046 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 20046
netstat -ano | findstr :20046

From another machine

nmap -p 20046 -sV <host>
sudo nmap -sU -p 20046 <host>
nc -zv <host> 20046

Block it in the firewall

sudo ufw deny 20046/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 20046" -Direction Inbound -LocalPort 20046 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 20046 used for?

Port 20046 is assigned by IANA to tmophl7mts (TMOP HL7 Message Transfer Service).

Is port 20046 TCP or UDP?

Port 20046 is registered for TCP and UDP.

Is it safe to open port 20046?

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 20046 is open?

On Linux run "ss -ltnup 'sport = :20046'", on macOS "lsof -nP -i :20046", and on Windows "netstat -ano | findstr :20046" to see the local process. From another machine, "nmap -p 20046 <host>" shows whether it is reachable.

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