Question
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
- 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 |
|
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