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// Other services

Port 2751:

Port 2751 is assigned by IANA to fjippol-port2 ().

2751

How fjippol-port2 works

Other services
client:2751fjippol-port2response client:2751fjippol-port2response

The client sends a request to port 2751 and the fjippol-port2 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 2751 dangerous?

We have no specific security note for port 2751. 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 2751

ServicePortTransportDescriptionReferenceUpdated
fjippol-port2 2751 TCP, UDP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2751, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2751'      # process listening on 2751
sudo lsof -nP -i :2751

macOS

sudo lsof -nP -i :2751

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2751 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2751
netstat -ano | findstr :2751

From another machine

nmap -p 2751 -sV <host>
sudo nmap -sU -p 2751 <host>
nc -zv <host> 2751

Block it in the firewall

sudo ufw deny 2751/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2751" -Direction Inbound -LocalPort 2751 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2751 used for?

Port 2751 is assigned by IANA to fjippol-port2 ().

Is port 2751 TCP or UDP?

Port 2751 is registered for TCP and UDP.

Is it safe to open port 2751?

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 2751 is open?

On Linux run "ss -ltnup 'sport = :2751'", on macOS "lsof -nP -i :2751", and on Windows "netstat -ano | findstr :2751" to see the local process. From another machine, "nmap -p 2751 <host>" shows whether it is reachable.

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