HTTPfy

Port 8444 (pcsync-http)

IANA assigns port 8444 to pcsync-http: PCsync HTTP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pcsync-http TCP PCsync HTTP Katy Lynn McCullough -
pcsync-http UDP PCsync HTTP Katy Lynn McCullough -

Check what is listening on port 8444

Linux: is anything listening on TCP 8444?
sudo ss -tlnp 'sport = :8444'
Linux: UDP 8444
sudo ss -ulnp 'sport = :8444'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8444
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8444 '
Windows (Command Prompt)
netstat -ano | findstr :8444
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8444 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8444
From Windows
Test-NetConnection HOST -Port 8444
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8444

Block port 8444 in the firewall

ufw
sudo ufw deny 8444/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8444 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8444 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8444' -Direction Inbound -Protocol TCP -LocalPort 8444 -Action Block
ufw
sudo ufw deny 8444/udp
iptables
sudo iptables -A INPUT -p udp --dport 8444 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8444 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8444' -Direction Inbound -Protocol UDP -LocalPort 8444 -Action Block

Related ports

8442cybro-a-bus8443HTTPS alternate8445copy, copy-disc8448matrix-fed

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