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// Other services

Port 11112: DICOM

Port 11112 is assigned by IANA to dicom (DICOM).

11112

How dicom works

Other services
client:11112dicomresponse client:11112dicomresponse

The client sends a request to port 11112 and the dicom 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 11112 dangerous?

We have no specific security note for port 11112. 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 11112

ServicePortTransportDescriptionReferenceUpdated
dicom 11112 TCP, UDP DICOM - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 11112, and is it reachable?

Linux

sudo ss -ltnup 'sport = :11112'      # process listening on 11112
sudo lsof -nP -i :11112

macOS

sudo lsof -nP -i :11112

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 11112 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 11112
netstat -ano | findstr :11112

From another machine

nmap -p 11112 -sV <host>
sudo nmap -sU -p 11112 <host>
nc -zv <host> 11112

Block it in the firewall

sudo ufw deny 11112/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 11112" -Direction Inbound -LocalPort 11112 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 11112 used for?

Port 11112 is assigned by IANA to dicom (DICOM).

Is port 11112 TCP or UDP?

Port 11112 is registered for TCP and UDP.

Is it safe to open port 11112?

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 11112 is open?

On Linux run "ss -ltnup 'sport = :11112'", on macOS "lsof -nP -i :11112", and on Windows "netstat -ano | findstr :11112" to see the local process. From another machine, "nmap -p 11112 <host>" shows whether it is reachable.

05 Related
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