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// Other services

Port 1493: netmap_lm

Port 1493 is assigned by IANA to netmap_lm (netmap_lm), netmap-lm (netmap_lm IANA assigned this well-formed service name as a replacement for "netmap_lm".).

1493

How netmap_lm works

Other services
client:1493netmap_lmresponse client:1493netmap_lmresponse

The client sends a request to port 1493 and the netmap_lm service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 1493 dangerous?

We have no specific security note for port 1493. 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 1493

ServicePortTransportDescriptionReferenceUpdated
netmap_lm 1493 TCP, UDP netmap_lm - -
netmap-lm 1493 TCP, UDP netmap_lm IANA assigned this well-formed service name as a replacement for "netmap_lm". - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1493, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1493'      # process listening on 1493
sudo lsof -nP -i :1493

macOS

sudo lsof -nP -i :1493

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1493 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1493
netstat -ano | findstr :1493

From another machine

nmap -p 1493 -sV <host>
sudo nmap -sU -p 1493 <host>
nc -zv <host> 1493

Block it in the firewall

sudo ufw deny 1493/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1493" -Direction Inbound -LocalPort 1493 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1493 used for?

Port 1493 is assigned by IANA to netmap_lm (netmap_lm), netmap-lm (netmap_lm IANA assigned this well-formed service name as a replacement for "netmap_lm".).

Is port 1493 TCP or UDP?

Port 1493 is registered for TCP and UDP.

Is it safe to open port 1493?

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 1493 is open?

On Linux run "ss -ltnup 'sport = :1493'", on macOS "lsof -nP -i :1493", and on Windows "netstat -ano | findstr :1493" to see the local process. From another machine, "nmap -p 1493 <host>" shows whether it is reachable.

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