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// Other services

Port 2953: OVALARMSRV

Port 2953 is assigned by IANA to ovalarmsrv (OVALARMSRV).

2953

How ovalarmsrv works

Other services
client:2953ovalarmsrvresponse client:2953ovalarmsrvresponse

The client sends a request to port 2953 and the ovalarmsrv 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 2953 dangerous?

We have no specific security note for port 2953. 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 2953

ServicePortTransportDescriptionReferenceUpdated
ovalarmsrv 2953 TCP, UDP OVALARMSRV - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2953, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2953'      # process listening on 2953
sudo lsof -nP -i :2953

macOS

sudo lsof -nP -i :2953

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2953 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2953
netstat -ano | findstr :2953

From another machine

nmap -p 2953 -sV <host>
sudo nmap -sU -p 2953 <host>
nc -zv <host> 2953

Block it in the firewall

sudo ufw deny 2953/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2953" -Direction Inbound -LocalPort 2953 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2953 used for?

Port 2953 is assigned by IANA to ovalarmsrv (OVALARMSRV).

Is port 2953 TCP or UDP?

Port 2953 is registered for TCP and UDP.

Is it safe to open port 2953?

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 2953 is open?

On Linux run "ss -ltnup 'sport = :2953'", on macOS "lsof -nP -i :2953", and on Windows "netstat -ano | findstr :2953" to see the local process. From another machine, "nmap -p 2953 <host>" shows whether it is reachable.

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