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// Other services

Port 1756: capfast-lmd

Port 1756 is assigned by IANA to capfast-lmd (capfast-lmd).

1756

How capfast-lmd works

Other services
client:1756capfast-lmdresponse client:1756capfast-lmdresponse

The client sends a request to port 1756 and the capfast-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 1756 dangerous?

We have no specific security note for port 1756. 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 1756

ServicePortTransportDescriptionReferenceUpdated
capfast-lmd 1756 TCP, UDP capfast-lmd - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1756, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1756'      # process listening on 1756
sudo lsof -nP -i :1756

macOS

sudo lsof -nP -i :1756

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1756 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1756
netstat -ano | findstr :1756

From another machine

nmap -p 1756 -sV <host>
sudo nmap -sU -p 1756 <host>
nc -zv <host> 1756

Block it in the firewall

sudo ufw deny 1756/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1756" -Direction Inbound -LocalPort 1756 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1756 used for?

Port 1756 is assigned by IANA to capfast-lmd (capfast-lmd).

Is port 1756 TCP or UDP?

Port 1756 is registered for TCP and UDP.

Is it safe to open port 1756?

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 1756 is open?

On Linux run "ss -ltnup 'sport = :1756'", on macOS "lsof -nP -i :1756", and on Windows "netstat -ano | findstr :1756" to see the local process. From another machine, "nmap -p 1756 <host>" shows whether it is reachable.

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