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// Other services

Port 7491: telops-lmd

Port 7491 is assigned by IANA to telops-lmd (telops-lmd).

7491

How telops-lmd works

Other services
client:7491telops-lmdresponse client:7491telops-lmdresponse

The client sends a request to port 7491 and the telops-lmd 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 7491 dangerous?

We have no specific security note for port 7491. 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 7491

ServicePortTransportDescriptionReferenceUpdated
telops-lmd 7491 TCP, UDP telops-lmd - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 7491, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7491'      # process listening on 7491
sudo lsof -nP -i :7491

macOS

sudo lsof -nP -i :7491

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7491 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7491
netstat -ano | findstr :7491

From another machine

nmap -p 7491 -sV <host>
sudo nmap -sU -p 7491 <host>
nc -zv <host> 7491

Block it in the firewall

sudo ufw deny 7491/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7491" -Direction Inbound -LocalPort 7491 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7491 used for?

Port 7491 is assigned by IANA to telops-lmd (telops-lmd).

Is port 7491 TCP or UDP?

Port 7491 is registered for TCP and UDP.

Is it safe to open port 7491?

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 7491 is open?

On Linux run "ss -ltnup 'sport = :7491'", on macOS "lsof -nP -i :7491", and on Windows "netstat -ano | findstr :7491" to see the local process. From another machine, "nmap -p 7491 <host>" shows whether it is reachable.

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