From the course: Subnetting in Your Head
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Non-routable addresses
- [Instructor] There are specific ranges of addresses that are said to be "nonroutable". Now, I'm using the term in quotes here because, in my opinion, that's not the right term to use. There's nothing wrong with the addresses. There's nothing wrong with their ones and zeros, that causes them to not be routable. The designers that put the internet together also made it a standard that these addresses would be filtered so that I can use them and you can use them, and even if the firewalls that separate us were to come down, there are other firewalls and filters that would keep us from seeing each other and having conflicting addresses. The addresses that are nonroutable include anything that starts with a 10, anything that starts in the range of 172.16 through 172.31 inclusive, in other words, 172.16.0.0 through 172.31.255.255, and 192.168, anything that starts with 192.168. These are the nonroutable addresses for Class A, Class B, and Class C. In addition, the designers held back…
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