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// Other services

Port 1941: DIC-Aida

Port 1941 is assigned by IANA to dic-aida (DIC-Aida).

1941

How dic-aida works

Other services
client:1941dic-aidaresponse client:1941dic-aidaresponse

The client sends a request to port 1941 and the dic-aida 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 1941 dangerous?

We have no specific security note for port 1941. 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 1941

ServicePortTransportDescriptionReferenceUpdated
dic-aida 1941 TCP, UDP DIC-Aida - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1941, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1941'      # process listening on 1941
sudo lsof -nP -i :1941

macOS

sudo lsof -nP -i :1941

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1941 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1941
netstat -ano | findstr :1941

From another machine

nmap -p 1941 -sV <host>
sudo nmap -sU -p 1941 <host>
nc -zv <host> 1941

Block it in the firewall

sudo ufw deny 1941/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1941" -Direction Inbound -LocalPort 1941 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1941 used for?

Port 1941 is assigned by IANA to dic-aida (DIC-Aida).

Is port 1941 TCP or UDP?

Port 1941 is registered for TCP and UDP.

Is it safe to open port 1941?

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 1941 is open?

On Linux run "ss -ltnup 'sport = :1941'", on macOS "lsof -nP -i :1941", and on Windows "netstat -ano | findstr :1941" to see the local process. From another machine, "nmap -p 1941 <host>" shows whether it is reachable.

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