CyberHunter
Local dataset, no network
// Other services

Port 21590: VoFR Gateway

Port 21590 is assigned by IANA to vofr-gateway (VoFR Gateway).

21590

How vofr-gateway works

Other services
client:21590vofr-gatewayresponse client:21590vofr-gatewayresponse

The client sends a request to port 21590 and the vofr-gateway 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 21590 dangerous?

We have no specific security note for port 21590. 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 21590

ServicePortTransportDescriptionReferenceUpdated
vofr-gateway 21590 TCP, UDP VoFR Gateway - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 21590, and is it reachable?

Linux

sudo ss -ltnup 'sport = :21590'      # process listening on 21590
sudo lsof -nP -i :21590

macOS

sudo lsof -nP -i :21590

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 21590 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 21590
netstat -ano | findstr :21590

From another machine

nmap -p 21590 -sV <host>
sudo nmap -sU -p 21590 <host>
nc -zv <host> 21590

Block it in the firewall

sudo ufw deny 21590/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 21590" -Direction Inbound -LocalPort 21590 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 21590 used for?

Port 21590 is assigned by IANA to vofr-gateway (VoFR Gateway).

Is port 21590 TCP or UDP?

Port 21590 is registered for TCP and UDP.

Is it safe to open port 21590?

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 21590 is open?

On Linux run "ss -ltnup 'sport = :21590'", on macOS "lsof -nP -i :21590", and on Windows "netstat -ano | findstr :21590" to see the local process. From another machine, "nmap -p 21590 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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