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// Other services

Port 4681: Parliant Telephony System

Port 4681 is assigned by IANA to parliant (Parliant Telephony System).

4681

How parliant works

Other services
client:4681parliantresponse client:4681parliantresponse

The client sends a request to port 4681 and the parliant 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 4681 dangerous?

We have no specific security note for port 4681. 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 4681

ServicePortTransportDescriptionReferenceUpdated
parliant 4681 TCP, UDP Parliant Telephony System - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 4681, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4681'      # process listening on 4681
sudo lsof -nP -i :4681

macOS

sudo lsof -nP -i :4681

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4681 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4681
netstat -ano | findstr :4681

From another machine

nmap -p 4681 -sV <host>
sudo nmap -sU -p 4681 <host>
nc -zv <host> 4681

Block it in the firewall

sudo ufw deny 4681/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4681" -Direction Inbound -LocalPort 4681 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4681 used for?

Port 4681 is assigned by IANA to parliant (Parliant Telephony System).

Is port 4681 TCP or UDP?

Port 4681 is registered for TCP and UDP.

Is it safe to open port 4681?

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 4681 is open?

On Linux run "ss -ltnup 'sport = :4681'", on macOS "lsof -nP -i :4681", and on Windows "netstat -ano | findstr :4681" to see the local process. From another machine, "nmap -p 4681 <host>" shows whether it is reachable.

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