CyberHunter
Local dataset, no network
// Other services

Port 650: OBEX

Port 650 is assigned by IANA to obex (OBEX).

650

How obex works

Other services
client:650obexresponse client:650obexresponse

The client sends a request to port 650 and the obex 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 650 dangerous?

We have no specific security note for port 650. 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 650

ServicePortTransportDescriptionReferenceUpdated
obex 650 TCP, UDP OBEX - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 650, and is it reachable?

Linux

sudo ss -ltnup 'sport = :650'      # process listening on 650
sudo lsof -nP -i :650

macOS

sudo lsof -nP -i :650

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 650 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 650
netstat -ano | findstr :650

From another machine

nmap -p 650 -sV <host>
sudo nmap -sU -p 650 <host>
nc -zv <host> 650

Block it in the firewall

sudo ufw deny 650/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 650" -Direction Inbound -LocalPort 650 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 650 used for?

Port 650 is assigned by IANA to obex (OBEX).

Is port 650 TCP or UDP?

Port 650 is registered for TCP and UDP.

Is it safe to open port 650?

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 650 is open?

On Linux run "ss -ltnup 'sport = :650'", on macOS "lsof -nP -i :650", and on Windows "netstat -ano | findstr :650" to see the local process. From another machine, "nmap -p 650 <host>" shows whether it is reachable.

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