CyberHunter
Local dataset, no network
// Other services

Port 4426: SMARTS Beacon Port

Port 4426 is assigned by IANA to beacon-port-2 (SMARTS Beacon Port).

4426

How beacon-port-2 works

Other services
client:4426beacon-port-2response client:4426beacon-port-2response

The client sends a request to port 4426 and the beacon-port-2 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 4426 dangerous?

We have no specific security note for port 4426. 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 4426

ServicePortTransportDescriptionReferenceUpdated
beacon-port-2 4426 TCP, UDP SMARTS Beacon Port - 2003-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 4426, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4426'      # process listening on 4426
sudo lsof -nP -i :4426

macOS

sudo lsof -nP -i :4426

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4426 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4426
netstat -ano | findstr :4426

From another machine

nmap -p 4426 -sV <host>
sudo nmap -sU -p 4426 <host>
nc -zv <host> 4426

Block it in the firewall

sudo ufw deny 4426/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4426" -Direction Inbound -LocalPort 4426 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4426 used for?

Port 4426 is assigned by IANA to beacon-port-2 (SMARTS Beacon Port).

Is port 4426 TCP or UDP?

Port 4426 is registered for TCP and UDP.

Is it safe to open port 4426?

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 4426 is open?

On Linux run "ss -ltnup 'sport = :4426'", on macOS "lsof -nP -i :4426", and on Windows "netstat -ano | findstr :4426" to see the local process. From another machine, "nmap -p 4426 <host>" shows whether it is reachable.

05 Related
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