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// Other services

Port 112: McIDAS Data Transmission Protocol

Port 112 is assigned by IANA to mcidas (McIDAS Data Transmission Protocol).

112

How mcidas works

Other services
client:112mcidasresponse client:112mcidasresponse

The client sends a request to port 112 and the mcidas 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 112 dangerous?

We have no specific security note for port 112. 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 112

ServicePortTransportDescriptionReferenceUpdated
mcidas 112 TCP, UDP McIDAS Data Transmission Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 112, and is it reachable?

Linux

sudo ss -ltnup 'sport = :112'      # process listening on 112
sudo lsof -nP -i :112

macOS

sudo lsof -nP -i :112

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 112 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 112
netstat -ano | findstr :112

From another machine

nmap -p 112 -sV <host>
sudo nmap -sU -p 112 <host>
nc -zv <host> 112

Block it in the firewall

sudo ufw deny 112/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 112" -Direction Inbound -LocalPort 112 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 112 used for?

Port 112 is assigned by IANA to mcidas (McIDAS Data Transmission Protocol).

Is port 112 TCP or UDP?

Port 112 is registered for TCP and UDP.

Is it safe to open port 112?

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 112 is open?

On Linux run "ss -ltnup 'sport = :112'", on macOS "lsof -nP -i :112", and on Windows "netstat -ano | findstr :112" to see the local process. From another machine, "nmap -p 112 <host>" shows whether it is reachable.

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