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// Other services

Port 2901: ALLSTORCNS

Port 2901 is assigned by IANA to allstorcns (ALLSTORCNS).

2901

How allstorcns works

Other services
client:2901allstorcnsresponse client:2901allstorcnsresponse

The client sends a request to port 2901 and the allstorcns 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 2901 dangerous?

We have no specific security note for port 2901. 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 2901

ServicePortTransportDescriptionReferenceUpdated
allstorcns 2901 TCP, UDP ALLSTORCNS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2901, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2901'      # process listening on 2901
sudo lsof -nP -i :2901

macOS

sudo lsof -nP -i :2901

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2901 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2901
netstat -ano | findstr :2901

From another machine

nmap -p 2901 -sV <host>
sudo nmap -sU -p 2901 <host>
nc -zv <host> 2901

Block it in the firewall

sudo ufw deny 2901/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2901" -Direction Inbound -LocalPort 2901 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2901 used for?

Port 2901 is assigned by IANA to allstorcns (ALLSTORCNS).

Is port 2901 TCP or UDP?

Port 2901 is registered for TCP and UDP.

Is it safe to open port 2901?

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 2901 is open?

On Linux run "ss -ltnup 'sport = :2901'", on macOS "lsof -nP -i :2901", and on Windows "netstat -ano | findstr :2901" to see the local process. From another machine, "nmap -p 2901 <host>" shows whether it is reachable.

05 Related
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