- 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.
Port 112: McIDAS Data Transmission Protocol
Port 112 is assigned by IANA to mcidas (McIDAS Data Transmission Protocol).
112
How mcidas works
Other servicesThe 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
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:
IANA registry entries for port 112
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| mcidas | 112 | TCP, UDP | McIDAS Data Transmission Protocol | - | - |
// source: IANA service name and port number registry
Which program uses port 112, and is it reachable?
Linux
sudo ss -ltnup 'sport = :112' # process listening on 112
sudo lsof -nP -i :112macOS
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
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.
Other other services ports
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp