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// Other services

Port 3725: Netia NA-ER Port

Port 3725 is assigned by IANA to na-er-tip (Netia NA-ER Port).

3725

How na-er-tip works

Other services
client:3725na-er-tipresponse client:3725na-er-tipresponse

The client sends a request to port 3725 and the na-er-tip 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 3725 dangerous?

We have no specific security note for port 3725. 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 3725

ServicePortTransportDescriptionReferenceUpdated
na-er-tip 3725 TCP, UDP Netia NA-ER Port - 2003-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 3725, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3725'      # process listening on 3725
sudo lsof -nP -i :3725

macOS

sudo lsof -nP -i :3725

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3725 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3725
netstat -ano | findstr :3725

From another machine

nmap -p 3725 -sV <host>
sudo nmap -sU -p 3725 <host>
nc -zv <host> 3725

Block it in the firewall

sudo ufw deny 3725/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3725" -Direction Inbound -LocalPort 3725 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3725 used for?

Port 3725 is assigned by IANA to na-er-tip (Netia NA-ER Port).

Is port 3725 TCP or UDP?

Port 3725 is registered for TCP and UDP.

Is it safe to open port 3725?

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 3725 is open?

On Linux run "ss -ltnup 'sport = :3725'", on macOS "lsof -nP -i :3725", and on Windows "netstat -ano | findstr :3725" to see the local process. From another machine, "nmap -p 3725 <host>" shows whether it is reachable.

05 Related
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