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// Other services

Port 7549: Network Layer Signaling Transport Layer

Port 7549 is assigned by IANA to nls-tl (Network Layer Signaling Transport Layer).

7549

How nls-tl works

Other services
client:7549nls-tlresponse client:7549nls-tlresponse

The client sends a request to port 7549 and the nls-tl 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 7549 dangerous?

We have no specific security note for port 7549. 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 7549

ServicePortTransportDescriptionReferenceUpdated
nls-tl 7549 TCP, UDP Network Layer Signaling Transport Layer - 2006-05

// source: IANA service name and port number registry

03 Check it

Which program uses port 7549, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7549'      # process listening on 7549
sudo lsof -nP -i :7549

macOS

sudo lsof -nP -i :7549

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7549 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7549
netstat -ano | findstr :7549

From another machine

nmap -p 7549 -sV <host>
sudo nmap -sU -p 7549 <host>
nc -zv <host> 7549

Block it in the firewall

sudo ufw deny 7549/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7549" -Direction Inbound -LocalPort 7549 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7549 used for?

Port 7549 is assigned by IANA to nls-tl (Network Layer Signaling Transport Layer).

Is port 7549 TCP or UDP?

Port 7549 is registered for TCP and UDP.

Is it safe to open port 7549?

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 7549 is open?

On Linux run "ss -ltnup 'sport = :7549'", on macOS "lsof -nP -i :7549", and on Windows "netstat -ano | findstr :7549" to see the local process. From another machine, "nmap -p 7549 <host>" shows whether it is reachable.

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