CyberHunter
Local dataset, no network
// Other services

Port 245: LINK

Port 245 is assigned by IANA to link (LINK).

245

How link works

Other services
client:245linkresponse client:245linkresponse

The client sends a request to port 245 and the link 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 245 dangerous?

We have no specific security note for port 245. 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 245

ServicePortTransportDescriptionReferenceUpdated
link 245 TCP, UDP LINK - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 245, and is it reachable?

Linux

sudo ss -ltnup 'sport = :245'      # process listening on 245
sudo lsof -nP -i :245

macOS

sudo lsof -nP -i :245

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 245 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 245
netstat -ano | findstr :245

From another machine

nmap -p 245 -sV <host>
sudo nmap -sU -p 245 <host>
nc -zv <host> 245

Block it in the firewall

sudo ufw deny 245/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 245" -Direction Inbound -LocalPort 245 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 245 used for?

Port 245 is assigned by IANA to link (LINK).

Is port 245 TCP or UDP?

Port 245 is registered for TCP and UDP.

Is it safe to open port 245?

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 245 is open?

On Linux run "ss -ltnup 'sport = :245'", on macOS "lsof -nP -i :245", and on Windows "netstat -ano | findstr :245" to see the local process. From another machine, "nmap -p 245 <host>" shows whether it is reachable.

05 Related
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