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Port 4744 (ifsp)

IANA assigns port 4744 to ifsp: Internet File Synchronization Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ifsp TCP Internet File Synchronization Protocol Alex White -
ifsp UDP Internet File Synchronization Protocol Alex White -

Registry dates for this port: registered 2007-09-12.

Check what is listening on port 4744

Linux: is anything listening on TCP 4744?
sudo ss -tlnp 'sport = :4744'
Linux: UDP 4744
sudo ss -ulnp 'sport = :4744'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4744
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4744 '
Windows (Command Prompt)
netstat -ano | findstr :4744
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4744 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4744
From Windows
Test-NetConnection HOST -Port 4744
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4744

Block port 4744 in the firewall

ufw
sudo ufw deny 4744/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4744 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4744 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4744' -Direction Inbound -Protocol TCP -LocalPort 4744 -Action Block
ufw
sudo ufw deny 4744/udp
iptables
sudo iptables -A INPUT -p udp --dport 4744 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4744 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4744' -Direction Inbound -Protocol UDP -LocalPort 4744 -Action Block

Related ports

4742sicct, sicct-sdp4743openhpid4745fmp4746intelliadm-disc

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.