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// Other services

Port 6653: OpenFlow

Port 6653 is assigned by IANA to openflow (OpenFlow).

6653

How openflow works

Other services
client:6653openflowresponse client:6653openflowresponse

The client sends a request to port 6653 and the openflow 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 6653 dangerous?

We have no specific security note for port 6653. 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 6653

ServicePortTransportDescriptionReferenceUpdated
openflow 6653 TCP, UDP OpenFlow - 2013-07-18

// source: IANA service name and port number registry

03 Check it

Which program uses port 6653, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6653'      # process listening on 6653
sudo lsof -nP -i :6653

macOS

sudo lsof -nP -i :6653

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6653 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6653
netstat -ano | findstr :6653

From another machine

nmap -p 6653 -sV <host>
sudo nmap -sU -p 6653 <host>
nc -zv <host> 6653

Block it in the firewall

sudo ufw deny 6653/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6653" -Direction Inbound -LocalPort 6653 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6653 used for?

Port 6653 is assigned by IANA to openflow (OpenFlow).

Is port 6653 TCP or UDP?

Port 6653 is registered for TCP and UDP.

Is it safe to open port 6653?

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 6653 is open?

On Linux run "ss -ltnup 'sport = :6653'", on macOS "lsof -nP -i :6653", and on Windows "netstat -ano | findstr :6653" to see the local process. From another machine, "nmap -p 6653 <host>" shows whether it is reachable.

05 Related
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