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

Port 402: Genie Protocol

Port 402 is assigned by IANA to genie (Genie Protocol).

402

How genie works

Other services
client:402genieresponse client:402genieresponse

The client sends a request to port 402 and the genie 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 402 dangerous?

We have no specific security note for port 402. 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 402

ServicePortTransportDescriptionReferenceUpdated
genie 402 TCP, UDP Genie Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 402, and is it reachable?

Linux

sudo ss -ltnup 'sport = :402'      # process listening on 402
sudo lsof -nP -i :402

macOS

sudo lsof -nP -i :402

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 402 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 402
netstat -ano | findstr :402

From another machine

nmap -p 402 -sV <host>
sudo nmap -sU -p 402 <host>
nc -zv <host> 402

Block it in the firewall

sudo ufw deny 402/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 402" -Direction Inbound -LocalPort 402 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 402 used for?

Port 402 is assigned by IANA to genie (Genie Protocol).

Is port 402 TCP or UDP?

Port 402 is registered for TCP and UDP.

Is it safe to open port 402?

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 402 is open?

On Linux run "ss -ltnup 'sport = :402'", on macOS "lsof -nP -i :402", and on Windows "netstat -ano | findstr :402" to see the local process. From another machine, "nmap -p 402 <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