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// Other services

Port 4341: LISP Data Packets

Port 4341 is assigned by IANA to lisp-data (LISP Data Packets).

4341

How lisp-data works

Other services
client:4341lisp-dataresponse client:4341lisp-dataresponse

The client sends a request to port 4341 and the lisp-data service answers.

Transport
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 4341 dangerous?

We have no specific security note for port 4341. 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 4341

ServicePortTransportDescriptionReferenceUpdated
lisp-data 4341 UDP LISP Data Packets RFC 9300 2021-02-17
-4341-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4341, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4341'      # process listening on 4341
sudo lsof -nP -i :4341

macOS

sudo lsof -nP -i :4341

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4341 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4341
netstat -ano | findstr :4341

From another machine

nmap -p 4341 -sV <host>
sudo nmap -sU -p 4341 <host>
nc -zv <host> 4341

Block it in the firewall

sudo ufw deny 4341/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4341" -Direction Inbound -LocalPort 4341 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 4341 used for?

Port 4341 is assigned by IANA to lisp-data (LISP Data Packets).

Is port 4341 TCP or UDP?

Port 4341 is registered for UDP.

Is it safe to open port 4341?

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 4341 is open?

On Linux run "ss -ltnup 'sport = :4341'", on macOS "lsof -nP -i :4341", and on Windows "netstat -ano | findstr :4341" to see the local process. From another machine, "nmap -p 4341 <host>" shows whether it is reachable.

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