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Domain Names and IP Addresses3:56 with Joy Kesten
A domain name is a word or phrase used to help people remember web addresses, or IP addresses. In this video let's check out how domain names and IP addresses work in more detail.
ICANN - the non-profit North American organisation responsible for Internet IP address space allocation and DNS management, among other technical management functions.
Fun Fact: Vint Cerf and Robert Kahn co-designed the Internet Protocol (IP) and the Transmission Control Protocol (TCP).
In every URL is a domain name. 0:00 A domain name is a word or phrase used to help people remember web addresses, or 0:02 IP addresses. 0:07 In this video, let's check out how domain names and IP addresses work. 0:09 In each domain name, there are a few parts labeled from right to left. 0:12 Top Level Domains, or TLDs are actually what most people think of as the end, 0:16 or extension of a domain. 0:22 A few Top Level Domains you're probably familiar with are .com, 0:24 .net, .edu, and .org. 0:30 However, this list also includes country codes, such as .uk for the United Kingdom, 0:33 .jp for Japan and .us for the United States and 0:38 even brand names, organizations and vanity words like .ninja and .name. 0:43 Top Level Domain names are managed by the Internet Corporation for 0:49 Assigned Names and Numbers or ICANN and can be found at www.icann.org. 0:54 ICANN authorize domain name registrars which are the companies responsible for 1:02 registering and reassigning domain names. 1:08 When we say domain names are organized from right to left, it means each label or 1:12 section between the dots, specifies a subdomain of the section to its right. 1:17 For example, in teamtreehouse.com, .com is the Top Level Domain, 1:22 teamtreehouse is a subdomain of .com. 1:29 If you've thought about this in terms of geography, 1:32 .com would be the country you live in, like the United States of America and 1:36 teamtreehouse is the state, or province. 1:41 Any subdomains of teamtreehouse.com, 1:44 like www.teamtreehouse.com are like the towns in the state, in the country. 1:48 An important function of domain names is to provide easily recognizable, 1:55 and memorable names to the numeric IP addresses of the servers where 2:00 the websites actually live. 2:04 If I wanted to find the treehouse website, using its domain name, 2:07 I would type in teamtreehouse.com into the address bar. 2:11 If I wanted to find the treehouse website, using its IP address, 2:15 I would type in 22.214.171.124 and 2:21 hit enter, and look, it's the same website. 2:26 Nearly everything on the web uses Internet Protocol version 4, or IPv4. 2:30 IPv4 is comprised of four numbers, each between 0 and 255, separated by dots. 2:38 IPv4 has the capacity to identify about 4.3 billion unique addresses, 2:46 but with over 7 billion people already on the planet and each person having more and 2:54 more devices connected to the Internet, IPv4 is quickly running out of space. 2:59 Luckily, there's already an alternative IP version 6 that's quickly catching on. 3:05 IPv6 will support every person on Earth 3:11 having billions of devices connected to the web at once. 3:14 IPv6 is kind of like adding more numbers to phone numbers as the population grows. 3:19 Phone numbers in a country often start with just a few numbers. 3:25 But, as more people get phones, phone numbers get longer and then, an area 3:29 code is added to differentiate the same number in different geographic regions. 3:34 IPv6 is the new format for IP addresses and 3:39 gives us billions of new phone number for all of the new devices on the web. 3:43 Now that we know a bit more about domain names and 3:48 IP addresses, let's find out how they're all connected with domain name servers 3:51
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