CyberHunter
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// Other services

Port 2731: Fyre Messanger

Port 2731 is assigned by IANA to fyre-messanger (Fyre Messanger).

2731

How fyre-messanger works

Other services
client:2731fyre-messangerresponse client:2731fyre-messangerresponse

The client sends a request to port 2731 and the fyre-messanger 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 2731 dangerous?

We have no specific security note for port 2731. 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 2731

ServicePortTransportDescriptionReferenceUpdated
fyre-messanger 2731 TCP, UDP Fyre Messanger - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2731, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2731'      # process listening on 2731
sudo lsof -nP -i :2731

macOS

sudo lsof -nP -i :2731

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2731 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2731
netstat -ano | findstr :2731

From another machine

nmap -p 2731 -sV <host>
sudo nmap -sU -p 2731 <host>
nc -zv <host> 2731

Block it in the firewall

sudo ufw deny 2731/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2731" -Direction Inbound -LocalPort 2731 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2731 used for?

Port 2731 is assigned by IANA to fyre-messanger (Fyre Messanger).

Is port 2731 TCP or UDP?

Port 2731 is registered for TCP and UDP.

Is it safe to open port 2731?

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 2731 is open?

On Linux run "ss -ltnup 'sport = :2731'", on macOS "lsof -nP -i :2731", and on Windows "netstat -ano | findstr :2731" to see the local process. From another machine, "nmap -p 2731 <host>" shows whether it is reachable.

05 Related
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