CyberHunter
Local dataset, no network
// Other services

Port 4342: LISP Control Packets

Port 4342 is assigned by IANA to lisp-control (LISP Control Packets).

4342

How lisp-control works

Other services
client:4342lisp-controlresponse client:4342lisp-controlresponse

The client sends a request to port 4342 and the lisp-control 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 4342 dangerous?

We have no specific security note for port 4342. 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 4342

ServicePortTransportDescriptionReferenceUpdated
lisp-control 4342 UDP LISP Control Packets RFC 9301 2021-02-25
-4342-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4342, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4342'      # process listening on 4342
sudo lsof -nP -i :4342

macOS

sudo lsof -nP -i :4342

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4342 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4342
netstat -ano | findstr :4342

From another machine

nmap -p 4342 -sV <host>
sudo nmap -sU -p 4342 <host>
nc -zv <host> 4342

Block it in the firewall

sudo ufw deny 4342/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4342" -Direction Inbound -LocalPort 4342 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 4342 used for?

Port 4342 is assigned by IANA to lisp-control (LISP Control Packets).

Is port 4342 TCP or UDP?

Port 4342 is registered for UDP.

Is it safe to open port 4342?

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 4342 is open?

On Linux run "ss -ltnup 'sport = :4342'", on macOS "lsof -nP -i :4342", and on Windows "netstat -ano | findstr :4342" to see the local process. From another machine, "nmap -p 4342 <host>" shows whether it is reachable.

05 Related
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