Clear definitions
Understand what every port does, the services behind it, and the traffic patterns to expect.
Port Library
Know your ports inside and out
Explore practical documentation for the ports engineers rely on daily. Each guide covers fundamentals, setup, and defenses so you can ship confidently.
What you'll learn
Quick facts at a glance
Review default ports, protocols, and usage patterns so you can validate connectivity in seconds.
Operational insights
Learn the reliability and performance considerations that keep real-world environments stable.
Browse port-by-port playbooks
Jump into any guide for deployment walkthroughs, quick facts, and mitigation strategies tailored to that protocol.
HTTPS 443
Port 443 · TCPEncrypt web applications with TLS certificates on port 443.
SFTP
Port 22/115 · TCPTransfer files securely through SSH tunnels.
SSH
Port 22 · TCPManage servers remotely with encrypted shell access.
SMB 445
Port 445 · TCPServe file shares and authentication over TCP.
SMB over TCP
Port 445 · TCPServe file shares and authentication over TCP.
HTTP 80
Port 80 · TCPServe web traffic without encryption on port 80.
DNS 53
Port 53 · UDP / TCPProvide name resolution for infrastructure.
Port 22
Port 22 · TCPManage servers remotely with encrypted shell access.
Telnet
Port 23 · TCPLegacy plaintext remote console access.
DNS Services
Port 53 · UDP / TCPProvide name resolution for infrastructure.
SNMP
Port 161/162 · UDPMonitor infrastructure with SNMP polling and traps.
Samba
Port 445 · TCPServe file shares and authentication over TCP.
RDP
Port 3389 · TCPProvide Windows remote desktop access.
NTP
Port 123 · UDPDistribute precise time to fleet devices.
ICMP
Port ICMP · ICMPTest reachability and latency with ICMP echo.
FRP
Port 7000 · TCPExpose internal apps through reverse tunnels.
Minecraft Server
Port 25565 · TCPHost multiplayer Minecraft worlds.
Port 3389
Port 3389 · TCPProvide Windows remote desktop access.
FTP
Port 20/21 · TCPServe classic file transfers on ports 20/21.
IMAP 143
Port 143 · TCPRetrieve email messages from servers.
SQL Services
Port 1433 · TCPExpose relational databases to applications.