CyberHunter
Local dataset, no network
// Other services

Port 3457: VAT default control

Port 3457 is assigned by IANA to vat-control (VAT default control).

3457

How vat-control works

Other services
client:3457vat-controlresponse client:3457vat-controlresponse

The client sends a request to port 3457 and the vat-control 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 3457 dangerous?

We have no specific security note for port 3457. 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 3457

ServicePortTransportDescriptionReferenceUpdated
vat-control 3457 TCP, UDP VAT default control - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3457, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3457'      # process listening on 3457
sudo lsof -nP -i :3457

macOS

sudo lsof -nP -i :3457

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3457 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3457
netstat -ano | findstr :3457

From another machine

nmap -p 3457 -sV <host>
sudo nmap -sU -p 3457 <host>
nc -zv <host> 3457

Block it in the firewall

sudo ufw deny 3457/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3457" -Direction Inbound -LocalPort 3457 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3457 used for?

Port 3457 is assigned by IANA to vat-control (VAT default control).

Is port 3457 TCP or UDP?

Port 3457 is registered for TCP and UDP.

Is it safe to open port 3457?

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 3457 is open?

On Linux run "ss -ltnup 'sport = :3457'", on macOS "lsof -nP -i :3457", and on Windows "netstat -ano | findstr :3457" to see the local process. From another machine, "nmap -p 3457 <host>" shows whether it is reachable.

05 Related
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