CyberHunter
LinkedIn profile - Bastien Cordier Email: contact@bastiencordier.pro
// Other services

Port 20005: OpenWebNet protocol for electric network

Port 20005 is assigned by IANA to openwebnet (OpenWebNet protocol for electric network).

20005

How openwebnet works

Other services
client:20005openwebnetresponse client:20005openwebnetresponse

The client sends a request to port 20005 and the openwebnet 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 20005 dangerous?

We have no specific security note for port 20005. 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 20005

ServicePortTransportDescriptionReferenceUpdated
openwebnet 20005 TCP, UDP OpenWebNet protocol for electric network - 2008-04-09

// source: IANA service name and port number registry

03 Check it

Which program uses port 20005, and is it reachable?

Linux

sudo ss -ltnup 'sport = :20005'      # process listening on 20005
sudo lsof -nP -i :20005

macOS

sudo lsof -nP -i :20005

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 20005 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 20005
netstat -ano | findstr :20005

From another machine

nmap -p 20005 -sV <host>
sudo nmap -sU -p 20005 <host>
nc -zv <host> 20005

Block it in the firewall

sudo ufw deny 20005/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 20005" -Direction Inbound -LocalPort 20005 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 20005 used for?

Port 20005 is assigned by IANA to openwebnet (OpenWebNet protocol for electric network).

Is port 20005 TCP or UDP?

Port 20005 is registered for TCP and UDP.

Is it safe to open port 20005?

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 20005 is open?

On Linux run "ss -ltnup 'sport = :20005'", on macOS "lsof -nP -i :20005", and on Windows "netstat -ano | findstr :20005" to see the local process. From another machine, "nmap -p 20005 <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

Latest vulnerability news

All news