The two starting points are what is a default gateway (the address your router presents to every device on your LAN) and RFC 1918 (the 1996 IETF document that reserved 192.168.x.x and the other private address ranges every home router uses). Read those two and the rest of the site becomes a lot less mysterious.
IP fundamentals
What Is an IP Address?
Understand what IP addresses are, how they work, and why every device on a network needs one.
What Is a Default Gateway?
Learn what a default gateway is and why it's the doorway between your local network and the internet.
Public vs Private IP Addresses
Understand the difference between public and private IP addresses and how NAT connects them.
IPv4 vs IPv6: What is the Difference?
Compare IPv4 and IPv6 protocols and understand why the world is transitioning to IPv6.
What Is a Subnet Mask?
Learn how subnet masks divide IP addresses into network and host portions.
What Is CIDR Notation?
Understand Classless Inter-Domain Routing and how CIDR notation like /24 defines subnets.
What Is DHCP?
Learn how the Dynamic Host Configuration Protocol automatically assigns IP addresses on your network.
What Is DNS?
Understand how the Domain Name System translates domain names into IP addresses.
What Is NAT?
Learn how Network Address Translation allows multiple devices to share a single public IP address.
What Is a MAC Address?
Understand the hardware address that uniquely identifies every network device.
IP Address Classes Explained (A, B, C, D, E)
Learn about the five IP address classes and how they define network sizes.
RFC 1918: Private IP Address Ranges
Understand the three private IP address ranges (10.x, 172.16.x, 192.168.x) defined in RFC 1918.
Networking basics
What Is a Router?
Learn what a router does and how it directs traffic between your local network and the internet.
What Is a Modem?
Understand what a modem does and how it connects your home network to your ISP.
Modem vs Router: What is the Difference?
Understand the key differences between a modem and a router and why you need both.
What Is an SSID?
Learn what a Service Set Identifier is and how it names your wireless network.
What Is a WiFi Hotspot?
Understand WiFi hotspots, how they work, and how to create one from your phone.
What Is Bandwidth?
Learn what bandwidth means, how it affects internet speed, and how it differs from throughput.
What Is Latency (Ping)?
Understand network latency, why it matters for gaming and video calls, and how to reduce it.
What Is WiFi?
Learn how WiFi technology enables wireless internet connectivity in your home and beyond.
What Is Ethernet?
Understand wired Ethernet connections, cable categories, and when wired beats wireless.
LAN vs WAN: What is the Difference?
Understand the difference between Local Area Networks and Wide Area Networks.
Wi-Fi standards
WiFi Standards Explained (802.11a/b/g/n/ac/ax/be)
Complete overview of all WiFi standards from the original 802.11 to WiFi 7.
What Is WiFi 6 (802.11ax)?
Learn about WiFi 6 features including OFDMA, MU-MIMO, and Target Wake Time.
What Is WiFi 7 (802.11be)?
Discover WiFi 7 capabilities including MLO, 320 MHz channels, and 4K QAM.
What Is MU-MIMO?
Learn how Multi-User Multiple Input Multiple Output technology serves multiple devices simultaneously.
What Is Beamforming?
Understand how beamforming focuses WiFi signals toward connected devices for better performance.
Security concepts
WPA vs WPA2 vs WPA3 Explained
Compare WiFi security protocols and understand the evolution from WPA to WPA3.
What Is WPS?
Learn about WiFi Protected Setup, how it works, and why it's a security risk.
WiFi Encryption Types Explained (WEP, TKIP, AES)
Understand the different WiFi encryption algorithms and which ones are still secure.
VPN Protocols Explained (OpenVPN, WireGuard, IPSec)
Compare popular VPN protocols and learn which is best for speed, security, and router use.
What Is a Firewall?
Learn how firewalls protect your network by filtering incoming and outgoing traffic.
What Is a VPN?
Understand how Virtual Private Networks encrypt your traffic and protect your privacy online.