CyberHunter
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// Other services

Port 25793: Vocaltec Address Server

Port 25793 is assigned by IANA to vocaltec-hos (Vocaltec Address Server).

25793

How vocaltec-hos works

Other services
client:25793vocaltec-hosresponse client:25793vocaltec-hosresponse

The client sends a request to port 25793 and the vocaltec-hos 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 25793 dangerous?

We have no specific security note for port 25793. 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 25793

ServicePortTransportDescriptionReferenceUpdated
vocaltec-hos 25793 TCP, UDP Vocaltec Address Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 25793, and is it reachable?

Linux

sudo ss -ltnup 'sport = :25793'      # process listening on 25793
sudo lsof -nP -i :25793

macOS

sudo lsof -nP -i :25793

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 25793 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 25793
netstat -ano | findstr :25793

From another machine

nmap -p 25793 -sV <host>
sudo nmap -sU -p 25793 <host>
nc -zv <host> 25793

Block it in the firewall

sudo ufw deny 25793/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 25793" -Direction Inbound -LocalPort 25793 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 25793 used for?

Port 25793 is assigned by IANA to vocaltec-hos (Vocaltec Address Server).

Is port 25793 TCP or UDP?

Port 25793 is registered for TCP and UDP.

Is it safe to open port 25793?

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 25793 is open?

On Linux run "ss -ltnup 'sport = :25793'", on macOS "lsof -nP -i :25793", and on Windows "netstat -ano | findstr :25793" to see the local process. From another machine, "nmap -p 25793 <host>" shows whether it is reachable.

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