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// Other services

Port 1942: Real Enterprise Service

Port 1942 is assigned by IANA to res (Real Enterprise Service).

1942

How res works

Other services
client:1942resresponse client:1942resresponse

The client sends a request to port 1942 and the res 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 1942 dangerous?

We have no specific security note for port 1942. 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 1942

ServicePortTransportDescriptionReferenceUpdated
res 1942 TCP, UDP Real Enterprise Service - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1942, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1942'      # process listening on 1942
sudo lsof -nP -i :1942

macOS

sudo lsof -nP -i :1942

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1942 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1942
netstat -ano | findstr :1942

From another machine

nmap -p 1942 -sV <host>
sudo nmap -sU -p 1942 <host>
nc -zv <host> 1942

Block it in the firewall

sudo ufw deny 1942/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1942" -Direction Inbound -LocalPort 1942 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1942 used for?

Port 1942 is assigned by IANA to res (Real Enterprise Service).

Is port 1942 TCP or UDP?

Port 1942 is registered for TCP and UDP.

Is it safe to open port 1942?

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 1942 is open?

On Linux run "ss -ltnup 'sport = :1942'", on macOS "lsof -nP -i :1942", and on Windows "netstat -ano | findstr :1942" to see the local process. From another machine, "nmap -p 1942 <host>" shows whether it is reachable.

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