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// Other services

Port 682: XFR

Port 682 is assigned by IANA to xfr (XFR).

682

How xfr works

Other services
client:682xfrresponse client:682xfrresponse

The client sends a request to port 682 and the xfr 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 682 dangerous?

We have no specific security note for port 682. 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 682

ServicePortTransportDescriptionReferenceUpdated
xfr 682 TCP, UDP XFR - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 682, and is it reachable?

Linux

sudo ss -ltnup 'sport = :682'      # process listening on 682
sudo lsof -nP -i :682

macOS

sudo lsof -nP -i :682

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 682 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 682
netstat -ano | findstr :682

From another machine

nmap -p 682 -sV <host>
sudo nmap -sU -p 682 <host>
nc -zv <host> 682

Block it in the firewall

sudo ufw deny 682/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 682" -Direction Inbound -LocalPort 682 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 682 used for?

Port 682 is assigned by IANA to xfr (XFR).

Is port 682 TCP or UDP?

Port 682 is registered for TCP and UDP.

Is it safe to open port 682?

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 682 is open?

On Linux run "ss -ltnup 'sport = :682'", on macOS "lsof -nP -i :682", and on Windows "netstat -ano | findstr :682" to see the local process. From another machine, "nmap -p 682 <host>" shows whether it is reachable.

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