Port 4744Internet File Synchronization Protocol

TCP/UDP port 4744 is assigned to the Internet File Synchronization Protocol, with no known common deployment.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

also known as ifsp

Technical Details

what runs on :4744

Internet File Synchronization Protocol is registered on port :4744 over tcp and udp to Alex White, assigned September 2007. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is never observed open, so if it's open on your network it's more likely a custom or misconfigured service than the registered one.

find what's listening on :4744

this machine

# linux
sudo ss -tulpn 'sport = :4744'

# macos / bsd
sudo lsof -nP -i :4744

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :4744

another host

nmap -sV -p T:4744 <host>
sudo nmap -sU -sV -p U:4744 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :4744

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

file transfer averages 3.4 across 180 ports — this one sits 2.4 below.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

no security notes recorded for :4744 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :4744
service: Internet File Synchronization Protocol
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: File Transfer
usage: The 2007 IANA assignment describes an Internet File Synchronization Protocol and is registered to Alex White. No widely used implementation or typical listener is known.
lookups: 0rank 993
added: 2026-10-05
updated: 2026-10-05
references: IANA service name registry — port 4744

Something wrong?

This record is maintained by the engineers who use port 4744. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-05.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 180 in file transfer →

the 8 most looked-up other ports in file transfer — 180 ports carry that label.

port	service	proto	category	risk	views
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
:17500	Dropbox LAN Sync	TCPUDP	File Transfer	caution	43.7k
:548	Apple Filing Protocol	TCP	File Transfer	caution	36.8k
:7000	Vuze HTTPS Tracker	TCPtls	Security	caution	28.9k
:1337	PowerFolder P2P	TCP	Security	caution	27.1k
:9001	SharePoint Authoring		Web Services	caution	26.3k
:8080	FilePhile Relay	UDP	File Transfer	caution	25.6k
:1337	WASTE Encrypted Sharing	TCP	Security	caution	22.9k

risk mix of the 8 listed

caution100%

1 of 8 encrypted

Port :4744Internet File Synchronization Protocol

Technical Details

Security Information

Related Ports

Port 4744Internet File Synchronization Protocol