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// Other services

Port 2509: fjmpss

Port 2509 is assigned by IANA to fjmpss (fjmpss).

2509

How fjmpss works

Other services
client:2509fjmpssresponse client:2509fjmpssresponse

The client sends a request to port 2509 and the fjmpss 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 2509 dangerous?

We have no specific security note for port 2509. 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 2509

ServicePortTransportDescriptionReferenceUpdated
fjmpss 2509 TCP, UDP fjmpss - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2509, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2509'      # process listening on 2509
sudo lsof -nP -i :2509

macOS

sudo lsof -nP -i :2509

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2509 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2509
netstat -ano | findstr :2509

From another machine

nmap -p 2509 -sV <host>
sudo nmap -sU -p 2509 <host>
nc -zv <host> 2509

Block it in the firewall

sudo ufw deny 2509/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2509" -Direction Inbound -LocalPort 2509 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2509 used for?

Port 2509 is assigned by IANA to fjmpss (fjmpss).

Is port 2509 TCP or UDP?

Port 2509 is registered for TCP and UDP.

Is it safe to open port 2509?

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 2509 is open?

On Linux run "ss -ltnup 'sport = :2509'", on macOS "lsof -nP -i :2509", and on Windows "netstat -ano | findstr :2509" to see the local process. From another machine, "nmap -p 2509 <host>" shows whether it is reachable.

05 Related
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