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// Other services

Port 2201: Advanced Training System Program

Port 2201 is assigned by IANA to ats (Advanced Training System Program).

2201

How ats works

Other services
client:2201atsresponse client:2201atsresponse

The client sends a request to port 2201 and the ats 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 2201 dangerous?

We have no specific security note for port 2201. 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 2201

ServicePortTransportDescriptionReferenceUpdated
ats 2201 TCP, UDP Advanced Training System Program - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2201, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2201'      # process listening on 2201
sudo lsof -nP -i :2201

macOS

sudo lsof -nP -i :2201

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2201 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2201
netstat -ano | findstr :2201

From another machine

nmap -p 2201 -sV <host>
sudo nmap -sU -p 2201 <host>
nc -zv <host> 2201

Block it in the firewall

sudo ufw deny 2201/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2201" -Direction Inbound -LocalPort 2201 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2201 used for?

Port 2201 is assigned by IANA to ats (Advanced Training System Program).

Is port 2201 TCP or UDP?

Port 2201 is registered for TCP and UDP.

Is it safe to open port 2201?

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 2201 is open?

On Linux run "ss -ltnup 'sport = :2201'", on macOS "lsof -nP -i :2201", and on Windows "netstat -ano | findstr :2201" to see the local process. From another machine, "nmap -p 2201 <host>" shows whether it is reachable.

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