The Internet and IP Addresses

Part of: Computer Systems & Networks

What Is the Internet? The internet is a global network of networks. No single computer or company controls it. Instead, billions of devices connect through shared agreements called protocols that let very different machines understand each other. Addresses and the Domain Name System Every device on the internet has an IP address (Internet Protocol address), a numeric label that identifies it. The most common form, IPv4 , looks like 192.168.1.1: four numbers (each 0-255) separated by dots. Because there are only about 4.3 billion IPv4 addresses, the newer IPv6 uses much longer addresses to support far more devices. Humans prefer names like codeflow.app, so the Domain Name System (DNS) acts like a phone book, translating names into IP addresses. Protocols Make It Work Protocols are agreed-upon rules for communication. Key examples: - IP routes data to the right address. - TCP (Transmission Control Protocol) ensures data arrives complete and in order. - HTTP/HTTPS define how web pages are requested and sent. Because these protocols are open standards , anyone can build a device or app that joins the network. This openness is why the internet is scalable : it grows without redesign. Ch

Challenge: Validate an IPv4 Address