CyberHunter
Local dataset, no network
// Other services

Port 1547: laplink

Port 1547 is assigned by IANA to laplink (laplink).

1547

How laplink works

Other services
client:1547laplinkresponse client:1547laplinkresponse

The client sends a request to port 1547 and the laplink 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 1547 dangerous?

We have no specific security note for port 1547. 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 1547

ServicePortTransportDescriptionReferenceUpdated
laplink 1547 TCP, UDP laplink - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1547, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1547'      # process listening on 1547
sudo lsof -nP -i :1547

macOS

sudo lsof -nP -i :1547

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1547 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1547
netstat -ano | findstr :1547

From another machine

nmap -p 1547 -sV <host>
sudo nmap -sU -p 1547 <host>
nc -zv <host> 1547

Block it in the firewall

sudo ufw deny 1547/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1547" -Direction Inbound -LocalPort 1547 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1547 used for?

Port 1547 is assigned by IANA to laplink (laplink).

Is port 1547 TCP or UDP?

Port 1547 is registered for TCP and UDP.

Is it safe to open port 1547?

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 1547 is open?

On Linux run "ss -ltnup 'sport = :1547'", on macOS "lsof -nP -i :1547", and on Windows "netstat -ano | findstr :1547" to see the local process. From another machine, "nmap -p 1547 <host>" shows whether it is reachable.

05 Related
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