Thought I'd call this post Classless Subnetting, but I can't because that's really a thing. So I came up with this really long tittle to joke about much I like thinking about Classful subnetting.

So I'm trying to study classful subnetting. Not because its required for the Network+ exam but because it could help me with a bit of CIDR notation and also its part of the Professor Messer's curriculum. On this coming Wednesday I will get a digital program from Cisco so I can practice networking on an enterprise switch, practice the Cisco Aspire Networking Game, and I've already enrolled in the Cisco Networking Academy courses. In the meantime I wrote these notes on Classful Subnetting. The table below isn't all the notes I've written but they should help understand a little of CIDR notation and Default subnet masking. I've seen this before, but never have been able to put it into a format that I can commit to memory.

Class	Binary	Decimal	Network Bits	Host Per Network	Default Subnet Mask
Class A	00000000	0	8	16,777,214	255.0.0.0
Class B	10000000	128	16	65,534	255.255.0.0
Class C	11000000	192	24	254	255.255.255.0
Class D	11100000	224	32		255.255.255.255
Class E	11110000	240	40
	11111000	248	48
	11111100	252	56
	11111110	254	64
	11111111	255	72