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// Other services

Port 20001: MicroSAN

Port 20001 is assigned by IANA to microsan (MicroSAN).

20001

How microsan works

Other services
client:20001microsanresponse client:20001microsanresponse

The client sends a request to port 20001 and the microsan 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 20001 dangerous?

We have no specific security note for port 20001. 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 20001

ServicePortTransportDescriptionReferenceUpdated
microsan 20001 TCP, UDP MicroSAN - 2004-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 20001, and is it reachable?

Linux

sudo ss -ltnup 'sport = :20001'      # process listening on 20001
sudo lsof -nP -i :20001

macOS

sudo lsof -nP -i :20001

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 20001 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 20001
netstat -ano | findstr :20001

From another machine

nmap -p 20001 -sV <host>
sudo nmap -sU -p 20001 <host>
nc -zv <host> 20001

Block it in the firewall

sudo ufw deny 20001/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 20001" -Direction Inbound -LocalPort 20001 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 20001 used for?

Port 20001 is assigned by IANA to microsan (MicroSAN).

Is port 20001 TCP or UDP?

Port 20001 is registered for TCP and UDP.

Is it safe to open port 20001?

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 20001 is open?

On Linux run "ss -ltnup 'sport = :20001'", on macOS "lsof -nP -i :20001", and on Windows "netstat -ano | findstr :20001" to see the local process. From another machine, "nmap -p 20001 <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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