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// Other services

Port 3652: VxCR NBU Default Port

Port 3652 is assigned by IANA to vxcrnbuport (VxCR NBU Default Port).

3652

How vxcrnbuport works

Other services
client:3652vxcrnbuportresponse client:3652vxcrnbuportresponse

The client sends a request to port 3652 and the vxcrnbuport 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 3652 dangerous?

We have no specific security note for port 3652. 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 3652

ServicePortTransportDescriptionReferenceUpdated
vxcrnbuport 3652 TCP, UDP VxCR NBU Default Port - 2003-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 3652, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3652'      # process listening on 3652
sudo lsof -nP -i :3652

macOS

sudo lsof -nP -i :3652

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3652 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3652
netstat -ano | findstr :3652

From another machine

nmap -p 3652 -sV <host>
sudo nmap -sU -p 3652 <host>
nc -zv <host> 3652

Block it in the firewall

sudo ufw deny 3652/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3652" -Direction Inbound -LocalPort 3652 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3652 used for?

Port 3652 is assigned by IANA to vxcrnbuport (VxCR NBU Default Port).

Is port 3652 TCP or UDP?

Port 3652 is registered for TCP and UDP.

Is it safe to open port 3652?

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 3652 is open?

On Linux run "ss -ltnup 'sport = :3652'", on macOS "lsof -nP -i :3652", and on Windows "netstat -ano | findstr :3652" to see the local process. From another machine, "nmap -p 3652 <host>" shows whether it is reachable.

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