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// Other services

Port 36423: SLm Interface Application Protocol

Port 36423 is assigned by IANA to slmap (SLm Interface Application Protocol).

36423

How slmap works

Other services
client:36423slmapresponse client:36423slmapresponse

The client sends a request to port 36423 and the slmap service answers.

Transport
SCTP
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 36423 dangerous?

We have no specific security note for port 36423. 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 36423

ServicePortTransportDescriptionReferenceUpdated
slmap 36423 SCTP SLm Interface Application Protocol - 2015-06-18

// source: IANA service name and port number registry

03 Check it

Which program uses port 36423, and is it reachable?

Linux

sudo ss -ltnup 'sport = :36423'      # process listening on 36423
sudo lsof -nP -i :36423

macOS

sudo lsof -nP -i :36423

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 36423 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 36423
netstat -ano | findstr :36423

From another machine

nmap -p 36423 -sV <host>
nc -zv <host> 36423

Block it in the firewall

sudo ufw deny 36423/sctp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 36423" -Direction Inbound -LocalPort 36423 -Protocol SCTP -Action Block  # Windows
04 FAQ
What is port 36423 used for?

Port 36423 is assigned by IANA to slmap (SLm Interface Application Protocol).

Is port 36423 TCP or UDP?

Port 36423 is registered for SCTP.

Is it safe to open port 36423?

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 36423 is open?

On Linux run "ss -ltnup 'sport = :36423'", on macOS "lsof -nP -i :36423", and on Windows "netstat -ano | findstr :36423" to see the local process. From another machine, "nmap -p 36423 <host>" shows whether it is reachable.

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