CyberHunter
Local dataset, no network
// Other services

Port 765:

Port 765 is assigned by IANA to webster ().

765

How webster works

Other services
client:765websterresponse client:765websterresponse

The client sends a request to port 765 and the webster 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 765 dangerous?

We have no specific security note for port 765. 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 765

ServicePortTransportDescriptionReferenceUpdated
webster 765 TCP, UDP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 765, and is it reachable?

Linux

sudo ss -ltnup 'sport = :765'      # process listening on 765
sudo lsof -nP -i :765

macOS

sudo lsof -nP -i :765

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 765 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 765
netstat -ano | findstr :765

From another machine

nmap -p 765 -sV <host>
sudo nmap -sU -p 765 <host>
nc -zv <host> 765

Block it in the firewall

sudo ufw deny 765/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 765" -Direction Inbound -LocalPort 765 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 765 used for?

Port 765 is assigned by IANA to webster ().

Is port 765 TCP or UDP?

Port 765 is registered for TCP and UDP.

Is it safe to open port 765?

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 765 is open?

On Linux run "ss -ltnup 'sport = :765'", on macOS "lsof -nP -i :765", and on Windows "netstat -ano | findstr :765" to see the local process. From another machine, "nmap -p 765 <host>" shows whether it is reachable.

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