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// Other services

Port 1724: csbphonemaster

Port 1724 is assigned by IANA to csbphonemaster (csbphonemaster).

1724

How csbphonemaster works

Other services
client:1724csbphonemasterresponse client:1724csbphonemasterresponse

The client sends a request to port 1724 and the csbphonemaster 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 1724 dangerous?

We have no specific security note for port 1724. 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 1724

ServicePortTransportDescriptionReferenceUpdated
csbphonemaster 1724 TCP, UDP csbphonemaster - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1724, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1724'      # process listening on 1724
sudo lsof -nP -i :1724

macOS

sudo lsof -nP -i :1724

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1724 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1724
netstat -ano | findstr :1724

From another machine

nmap -p 1724 -sV <host>
sudo nmap -sU -p 1724 <host>
nc -zv <host> 1724

Block it in the firewall

sudo ufw deny 1724/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1724" -Direction Inbound -LocalPort 1724 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1724 used for?

Port 1724 is assigned by IANA to csbphonemaster (csbphonemaster).

Is port 1724 TCP or UDP?

Port 1724 is registered for TCP and UDP.

Is it safe to open port 1724?

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 1724 is open?

On Linux run "ss -ltnup 'sport = :1724'", on macOS "lsof -nP -i :1724", and on Windows "netstat -ano | findstr :1724" to see the local process. From another machine, "nmap -p 1724 <host>" shows whether it is reachable.

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