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// Other services

Port 5436: pmip6-cntl

Port 5436 is assigned by IANA to pmip6-cntl (pmip6-cntl).

5436

How pmip6-cntl works

Other services
client:5436pmip6-cntlresponse client:5436pmip6-cntlresponse

The client sends a request to port 5436 and the pmip6-cntl 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 5436 dangerous?

We have no specific security note for port 5436. 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 5436

ServicePortTransportDescriptionReferenceUpdated
pmip6-cntl 5436 UDP pmip6-cntl RFC 5844 -
-5436-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5436, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5436'      # process listening on 5436
sudo lsof -nP -i :5436

macOS

sudo lsof -nP -i :5436

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5436 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5436
netstat -ano | findstr :5436

From another machine

nmap -p 5436 -sV <host>
sudo nmap -sU -p 5436 <host>
nc -zv <host> 5436

Block it in the firewall

sudo ufw deny 5436/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5436" -Direction Inbound -LocalPort 5436 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 5436 used for?

Port 5436 is assigned by IANA to pmip6-cntl (pmip6-cntl).

Is port 5436 TCP or UDP?

Port 5436 is registered for UDP.

Is it safe to open port 5436?

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 5436 is open?

On Linux run "ss -ltnup 'sport = :5436'", on macOS "lsof -nP -i :5436", and on Windows "netstat -ano | findstr :5436" to see the local process. From another machine, "nmap -p 5436 <host>" shows whether it is reachable.

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