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// Other services

Port 7543: atul server

Port 7543 is assigned by IANA to atul (atul server).

7543

How atul works

Other services
client:7543atulresponse client:7543atulresponse

The client sends a request to port 7543 and the atul 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 7543 dangerous?

We have no specific security note for port 7543. 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 7543

ServicePortTransportDescriptionReferenceUpdated
atul 7543 TCP, UDP atul server - 2006-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 7543, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7543'      # process listening on 7543
sudo lsof -nP -i :7543

macOS

sudo lsof -nP -i :7543

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7543 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7543
netstat -ano | findstr :7543

From another machine

nmap -p 7543 -sV <host>
sudo nmap -sU -p 7543 <host>
nc -zv <host> 7543

Block it in the firewall

sudo ufw deny 7543/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7543" -Direction Inbound -LocalPort 7543 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7543 used for?

Port 7543 is assigned by IANA to atul (atul server).

Is port 7543 TCP or UDP?

Port 7543 is registered for TCP and UDP.

Is it safe to open port 7543?

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 7543 is open?

On Linux run "ss -ltnup 'sport = :7543'", on macOS "lsof -nP -i :7543", and on Windows "netstat -ano | findstr :7543" to see the local process. From another machine, "nmap -p 7543 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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