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// Other services

Port 1653: alphatech-lm

Port 1653 is assigned by IANA to alphatech-lm (alphatech-lm).

1653

How alphatech-lm works

Other services
client:1653alphatech-lmresponse client:1653alphatech-lmresponse

The client sends a request to port 1653 and the alphatech-lm 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 1653 dangerous?

We have no specific security note for port 1653. 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 1653

ServicePortTransportDescriptionReferenceUpdated
alphatech-lm 1653 TCP, UDP alphatech-lm - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1653, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1653'      # process listening on 1653
sudo lsof -nP -i :1653

macOS

sudo lsof -nP -i :1653

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1653 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1653
netstat -ano | findstr :1653

From another machine

nmap -p 1653 -sV <host>
sudo nmap -sU -p 1653 <host>
nc -zv <host> 1653

Block it in the firewall

sudo ufw deny 1653/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1653" -Direction Inbound -LocalPort 1653 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1653 used for?

Port 1653 is assigned by IANA to alphatech-lm (alphatech-lm).

Is port 1653 TCP or UDP?

Port 1653 is registered for TCP and UDP.

Is it safe to open port 1653?

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 1653 is open?

On Linux run "ss -ltnup 'sport = :1653'", on macOS "lsof -nP -i :1653", and on Windows "netstat -ano | findstr :1653" to see the local process. From another machine, "nmap -p 1653 <host>" shows whether it is reachable.

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