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// Other services

Port 1791: EA1

Port 1791 is assigned by IANA to ea1 (EA1).

1791

How ea1 works

Other services
client:1791ea1response client:1791ea1response

The client sends a request to port 1791 and the ea1 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 1791 dangerous?

We have no specific security note for port 1791. 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 1791

ServicePortTransportDescriptionReferenceUpdated
ea1 1791 TCP, UDP EA1 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1791, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1791'      # process listening on 1791
sudo lsof -nP -i :1791

macOS

sudo lsof -nP -i :1791

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1791 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1791
netstat -ano | findstr :1791

From another machine

nmap -p 1791 -sV <host>
sudo nmap -sU -p 1791 <host>
nc -zv <host> 1791

Block it in the firewall

sudo ufw deny 1791/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1791" -Direction Inbound -LocalPort 1791 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1791 used for?

Port 1791 is assigned by IANA to ea1 (EA1).

Is port 1791 TCP or UDP?

Port 1791 is registered for TCP and UDP.

Is it safe to open port 1791?

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 1791 is open?

On Linux run "ss -ltnup 'sport = :1791'", on macOS "lsof -nP -i :1791", and on Windows "netstat -ano | findstr :1791" to see the local process. From another machine, "nmap -p 1791 <host>" shows whether it is reachable.

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