IP Addressing and Subnets
Understand IPv4, IPv6, CIDR notation, and how subnets divide networks.
What is an IP Address?
An IP address is a unique numerical label assigned to each device on a network, enabling routing of traffic between source and destination. IPv4 uses 32-bit addresses (e.g., 192.168.1.10); IPv6 uses 128-bit addresses.
IPv4 Address Structure
An IPv4 address has four octets separated by dots. Each octet is 0–255. Example: 10.0.0.1.
IP addresses have two parts: the network portion (identifies the network) and the host portion (identifies the device).
All lessons in this course
- IP Addressing and Subnets
- TCP vs UDP: When Each Is Used
- DNS: How Domains Resolve to IPs
- HTTP and HTTPS Basics