1. Did you know you can even have odd subnets like /127, /126, /125, /123, etc..?

It may seem intimidating but its actually pretty simple.

Lets take this example IP: 2001:EF01:2345::FFFF

Next, lets take the last hextet from that IP: FFFF

Lastly, lets take out the last nibble from that hextet: F

In decimal format, what number does F represent? _____15______________________________

How many binary digits do you need to represent that number? _______4__________________

How many numbers are between /128 and /124? ___________16__________________________

Piece it together yet? If not, lets break it down this way.

CIDR	End of Range	Binary Representation
/128	::	0000
/127	::1	0001
/126	::3	0011
/125	::7	0111
/124	::F	1111

Now it your turn. try and finish these ranges.

CIDR	End of Range	CIDR	End of Range
/123	::1F	/76	::F:FFFF:FFFF:FFFF
/122	::3F	/75	::1F:FFFF:FFFF:FFFF
/121		/74
/120		/73
/119		/44
/118		/43
/117		/42
/116		/41
/115		/19
/114		/18
/113		/17