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// Other services

Port 5741: IDA Discover Port 1

Port 5741 is assigned by IANA to ida-discover1 (IDA Discover Port 1).

5741

How ida-discover1 works

Other services
client:5741ida-discover1response client:5741ida-discover1response

The client sends a request to port 5741 and the ida-discover1 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 5741 dangerous?

We have no specific security note for port 5741. 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 5741

ServicePortTransportDescriptionReferenceUpdated
ida-discover1 5741 TCP, UDP IDA Discover Port 1 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5741, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5741'      # process listening on 5741
sudo lsof -nP -i :5741

macOS

sudo lsof -nP -i :5741

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5741 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5741
netstat -ano | findstr :5741

From another machine

nmap -p 5741 -sV <host>
sudo nmap -sU -p 5741 <host>
nc -zv <host> 5741

Block it in the firewall

sudo ufw deny 5741/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5741" -Direction Inbound -LocalPort 5741 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5741 used for?

Port 5741 is assigned by IANA to ida-discover1 (IDA Discover Port 1).

Is port 5741 TCP or UDP?

Port 5741 is registered for TCP and UDP.

Is it safe to open port 5741?

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 5741 is open?

On Linux run "ss -ltnup 'sport = :5741'", on macOS "lsof -nP -i :5741", and on Windows "netstat -ano | findstr :5741" to see the local process. From another machine, "nmap -p 5741 <host>" shows whether it is reachable.

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