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// Other services

Port 4682: finisar

Port 4682 is assigned by IANA to finisar (finisar).

4682

How finisar works

Other services
client:4682finisarresponse client:4682finisarresponse

The client sends a request to port 4682 and the finisar 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 4682 dangerous?

We have no specific security note for port 4682. 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 4682

ServicePortTransportDescriptionReferenceUpdated
finisar 4682 TCP, UDP finisar - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 4682, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4682'      # process listening on 4682
sudo lsof -nP -i :4682

macOS

sudo lsof -nP -i :4682

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4682 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4682
netstat -ano | findstr :4682

From another machine

nmap -p 4682 -sV <host>
sudo nmap -sU -p 4682 <host>
nc -zv <host> 4682

Block it in the firewall

sudo ufw deny 4682/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4682" -Direction Inbound -LocalPort 4682 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4682 used for?

Port 4682 is assigned by IANA to finisar (finisar).

Is port 4682 TCP or UDP?

Port 4682 is registered for TCP and UDP.

Is it safe to open port 4682?

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 4682 is open?

On Linux run "ss -ltnup 'sport = :4682'", on macOS "lsof -nP -i :4682", and on Windows "netstat -ano | findstr :4682" to see the local process. From another machine, "nmap -p 4682 <host>" shows whether it is reachable.

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