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// Other services

Port 1725: iden-ralp

Port 1725 is assigned by IANA to iden-ralp (iden-ralp).

1725

How iden-ralp works

Other services
client:1725iden-ralpresponse client:1725iden-ralpresponse

The client sends a request to port 1725 and the iden-ralp 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 1725 dangerous?

We have no specific security note for port 1725. 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 1725

ServicePortTransportDescriptionReferenceUpdated
iden-ralp 1725 TCP, UDP iden-ralp - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1725, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1725'      # process listening on 1725
sudo lsof -nP -i :1725

macOS

sudo lsof -nP -i :1725

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1725 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1725
netstat -ano | findstr :1725

From another machine

nmap -p 1725 -sV <host>
sudo nmap -sU -p 1725 <host>
nc -zv <host> 1725

Block it in the firewall

sudo ufw deny 1725/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1725" -Direction Inbound -LocalPort 1725 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1725 used for?

Port 1725 is assigned by IANA to iden-ralp (iden-ralp).

Is port 1725 TCP or UDP?

Port 1725 is registered for TCP and UDP.

Is it safe to open port 1725?

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 1725 is open?

On Linux run "ss -ltnup 'sport = :1725'", on macOS "lsof -nP -i :1725", and on Windows "netstat -ano | findstr :1725" to see the local process. From another machine, "nmap -p 1725 <host>" shows whether it is reachable.

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