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// Other services

Port 8401: sabarsd

Port 8401 is assigned by IANA to sabarsd (sabarsd).

8401

How sabarsd works

Other services
client:8401sabarsdresponse client:8401sabarsdresponse

The client sends a request to port 8401 and the sabarsd 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 8401 dangerous?

We have no specific security note for port 8401. 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 8401

ServicePortTransportDescriptionReferenceUpdated
sabarsd 8401 TCP, UDP sabarsd - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 8401, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8401'      # process listening on 8401
sudo lsof -nP -i :8401

macOS

sudo lsof -nP -i :8401

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8401 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8401
netstat -ano | findstr :8401

From another machine

nmap -p 8401 -sV <host>
sudo nmap -sU -p 8401 <host>
nc -zv <host> 8401

Block it in the firewall

sudo ufw deny 8401/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8401" -Direction Inbound -LocalPort 8401 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8401 used for?

Port 8401 is assigned by IANA to sabarsd (sabarsd).

Is port 8401 TCP or UDP?

Port 8401 is registered for TCP and UDP.

Is it safe to open port 8401?

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 8401 is open?

On Linux run "ss -ltnup 'sport = :8401'", on macOS "lsof -nP -i :8401", and on Windows "netstat -ano | findstr :8401" to see the local process. From another machine, "nmap -p 8401 <host>" shows whether it is reachable.

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