port number
Connection endpoint identifier
A port number is a numerical identifier (0–65535) that directs network traffic to specific applications or services on a computer.
When data arrives at a device, the port number tells the operating system which program should receive it.
Well-known ports handle standard services: 80 for web traffic, 443 for secure connections, 25 for email.
The firewall blocks all incoming traffic except on port 22.
- FTPData transmission standard
- packetSmall sealed container
- UDPConnectionless transmission standard
- HTTPWeb data transmission standard
- TCPConnection-oriented network protocol
DNS · SMTP · multiplexing · endpoint · 80 · listening · SSH · datagram · connectionless · protocol · handshake · ephemeral · localhost · tunnel · traffic · ping · service · router
port numberIP address
Device's unique network number
MAC address · physical address · hostname · domain name · server address
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