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Update tcpip-addressing-and-subnetting.md #1593

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Expand Up @@ -72,7 +72,7 @@ Internet RFC 1878 (available from [InterNIC-Public Information Regarding Interne

## Network classes

Internet addresses are allocated by the [InterNIC](https://www.internic.net), the organization that administers the Internet. These IP addresses are divided into classes. The most common of them are classes A, B, and C. Classes D and E exist, but aren't used by end users. Each of the address classes has a different default subnet mask. You can identify the class of an IP address by looking at its first octet. Following are the ranges of Class A, B, and C Internet addresses, each with an example address:
IP addresses are allocated by the [InterNIC](https://www.internic.net), the organization that administers the Internet. These IP addresses are divided into classes. The most common of them are classes A, B, and C. Classes D and E exist, but aren't used by end users. Each of the address classes has a different default subnet mask. You can identify the class of an IP address by looking at its first octet. Following are the ranges of Class A, B, and C Internet addresses, each with an example address:

- Class A networks use a default subnet mask of 255.0.0.0 and have 0-127 as their first octet. The address 10.52.36.11 is a class A address. Its first octet is 10, which is between 1 and 126, inclusive.

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