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// Other services

Port 683: CORBA IIOP

Port 683 is assigned by IANA to corba-iiop (CORBA IIOP).

683

How corba-iiop works

Other services
client:683corba-iiopresponse client:683corba-iiopresponse

The client sends a request to port 683 and the corba-iiop 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 683 dangerous?

We have no specific security note for port 683. 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 683

ServicePortTransportDescriptionReferenceUpdated
corba-iiop 683 TCP, UDP CORBA IIOP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 683, and is it reachable?

Linux

sudo ss -ltnup 'sport = :683'      # process listening on 683
sudo lsof -nP -i :683

macOS

sudo lsof -nP -i :683

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 683 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 683
netstat -ano | findstr :683

From another machine

nmap -p 683 -sV <host>
sudo nmap -sU -p 683 <host>
nc -zv <host> 683

Block it in the firewall

sudo ufw deny 683/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 683" -Direction Inbound -LocalPort 683 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 683 used for?

Port 683 is assigned by IANA to corba-iiop (CORBA IIOP).

Is port 683 TCP or UDP?

Port 683 is registered for TCP and UDP.

Is it safe to open port 683?

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 683 is open?

On Linux run "ss -ltnup 'sport = :683'", on macOS "lsof -nP -i :683", and on Windows "netstat -ano | findstr :683" to see the local process. From another machine, "nmap -p 683 <host>" shows whether it is reachable.

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