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// Other services

Port 4744: Internet File Synchronization Protocol

Port 4744 is assigned by IANA to ifsp (Internet File Synchronization Protocol).

4744

How ifsp works

Other services
client:4744ifspresponse client:4744ifspresponse

The client sends a request to port 4744 and the ifsp 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 4744 dangerous?

We have no specific security note for port 4744. 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 4744

ServicePortTransportDescriptionReferenceUpdated
ifsp 4744 TCP, UDP Internet File Synchronization Protocol - 2007-09-12

// source: IANA service name and port number registry

03 Check it

Which program uses port 4744, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4744'      # process listening on 4744
sudo lsof -nP -i :4744

macOS

sudo lsof -nP -i :4744

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4744 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4744
netstat -ano | findstr :4744

From another machine

nmap -p 4744 -sV <host>
sudo nmap -sU -p 4744 <host>
nc -zv <host> 4744

Block it in the firewall

sudo ufw deny 4744/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4744" -Direction Inbound -LocalPort 4744 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4744 used for?

Port 4744 is assigned by IANA to ifsp (Internet File Synchronization Protocol).

Is port 4744 TCP or UDP?

Port 4744 is registered for TCP and UDP.

Is it safe to open port 4744?

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 4744 is open?

On Linux run "ss -ltnup 'sport = :4744'", on macOS "lsof -nP -i :4744", and on Windows "netstat -ano | findstr :4744" to see the local process. From another machine, "nmap -p 4744 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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