CyberHunter
Local dataset, no network
// Other services

Port 19788: Mesh Link Establishment

Port 19788 is assigned by IANA to mle (Mesh Link Establishment).

19788

How mle works

Other services
client:19788mleresponse client:19788mleresponse

The client sends a request to port 19788 and the mle 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 19788 dangerous?

We have no specific security note for port 19788. 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 19788

ServicePortTransportDescriptionReferenceUpdated
mle 19788 UDP Mesh Link Establishment - 2012-12-18
-19788-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 19788, and is it reachable?

Linux

sudo ss -ltnup 'sport = :19788'      # process listening on 19788
sudo lsof -nP -i :19788

macOS

sudo lsof -nP -i :19788

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 19788 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 19788
netstat -ano | findstr :19788

From another machine

nmap -p 19788 -sV <host>
sudo nmap -sU -p 19788 <host>
nc -zv <host> 19788

Block it in the firewall

sudo ufw deny 19788/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 19788" -Direction Inbound -LocalPort 19788 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 19788 used for?

Port 19788 is assigned by IANA to mle (Mesh Link Establishment).

Is port 19788 TCP or UDP?

Port 19788 is registered for UDP.

Is it safe to open port 19788?

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 19788 is open?

On Linux run "ss -ltnup 'sport = :19788'", on macOS "lsof -nP -i :19788", and on Windows "netstat -ano | findstr :19788" to see the local process. From another machine, "nmap -p 19788 <host>" shows whether it is reachable.

05 Related
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