HTTPfy

Port 4452 (ctiprogramload)

IANA assigns port 4452 to ctiprogramload: CTI Program Load.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ctiprogramload TCP CTI Program Load Control Technology Inc -
ctiprogramload UDP CTI Program Load Control Technology Inc -

Registry dates for this port: last modified 2011-10-28.

Check what is listening on port 4452

Linux: is anything listening on TCP 4452?
sudo ss -tlnp 'sport = :4452'
Linux: UDP 4452
sudo ss -ulnp 'sport = :4452'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4452
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4452 '
Windows (Command Prompt)
netstat -ano | findstr :4452
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4452 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4452
From Windows
Test-NetConnection HOST -Port 4452
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4452

Block port 4452 in the firewall

ufw
sudo ufw deny 4452/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4452 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4452 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4452' -Direction Inbound -Protocol TCP -LocalPort 4452 -Action Block
ufw
sudo ufw deny 4452/udp
iptables
sudo iptables -A INPUT -p udp --dport 4452 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4452 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4452' -Direction Inbound -Protocol UDP -LocalPort 4452 -Action Block

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