Subnet Mask - Hsanokklis/2022-2023-Tech-journal GitHub Wiki

Classful Addressing:

• Addresses were handed out in classes
• A,B,C,D,E

Class A

• subnet mask of 255.0.0.0/8
• ranges from 1.0.0.0 - 127.255.255.255
• 0.0.0.0 is not routable
• 10.0.0.0 - 10.255.255.255 is reserved as private class A space

Class B

• Subnet mask of 255.255.0.0/16
• 128.0.0.0 - 191.255.255.255

Class C

• Subnet mask of 255.255.255.0/24
• 192.0.0.0 - 233.255.255.255