CyberHunter
Local dataset, no network
// Other services

Port 3657: ImmediaNet Beacon

Port 3657 is assigned by IANA to immedianet-bcn (ImmediaNet Beacon).

3657

How immedianet-bcn works

Other services
client:3657immedianet-bcnresponse client:3657immedianet-bcnresponse

The client sends a request to port 3657 and the immedianet-bcn 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 3657 dangerous?

We have no specific security note for port 3657. 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 3657

ServicePortTransportDescriptionReferenceUpdated
immedianet-bcn 3657 TCP, UDP ImmediaNet Beacon - 2003-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 3657, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3657'      # process listening on 3657
sudo lsof -nP -i :3657

macOS

sudo lsof -nP -i :3657

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3657 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3657
netstat -ano | findstr :3657

From another machine

nmap -p 3657 -sV <host>
sudo nmap -sU -p 3657 <host>
nc -zv <host> 3657

Block it in the firewall

sudo ufw deny 3657/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3657" -Direction Inbound -LocalPort 3657 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3657 used for?

Port 3657 is assigned by IANA to immedianet-bcn (ImmediaNet Beacon).

Is port 3657 TCP or UDP?

Port 3657 is registered for TCP and UDP.

Is it safe to open port 3657?

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 3657 is open?

On Linux run "ss -ltnup 'sport = :3657'", on macOS "lsof -nP -i :3657", and on Windows "netstat -ano | findstr :3657" to see the local process. From another machine, "nmap -p 3657 <host>" shows whether it is reachable.

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