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// Other services

Port 2149: ACPTSYS

Port 2149 is assigned by IANA to acptsys (ACPTSYS).

2149

How acptsys works

Other services
client:2149acptsysresponse client:2149acptsysresponse

The client sends a request to port 2149 and the acptsys 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 2149 dangerous?

We have no specific security note for port 2149. 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 2149

ServicePortTransportDescriptionReferenceUpdated
acptsys 2149 TCP, UDP ACPTSYS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2149, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2149'      # process listening on 2149
sudo lsof -nP -i :2149

macOS

sudo lsof -nP -i :2149

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2149 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2149
netstat -ano | findstr :2149

From another machine

nmap -p 2149 -sV <host>
sudo nmap -sU -p 2149 <host>
nc -zv <host> 2149

Block it in the firewall

sudo ufw deny 2149/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2149" -Direction Inbound -LocalPort 2149 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2149 used for?

Port 2149 is assigned by IANA to acptsys (ACPTSYS).

Is port 2149 TCP or UDP?

Port 2149 is registered for TCP and UDP.

Is it safe to open port 2149?

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 2149 is open?

On Linux run "ss -ltnup 'sport = :2149'", on macOS "lsof -nP -i :2149", and on Windows "netstat -ano | findstr :2149" to see the local process. From another machine, "nmap -p 2149 <host>" shows whether it is reachable.

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