After refreshing my memory on subnet architecture (and having a friend catch an overlap in my subnets even though I have a VLAN separation) I happened upon the following rather obvious pattern that tranches up the ever popular 192.168/16 subnet in a way that the gateway always ends in .1 and the last IP is always a .254 (not counting the broadcast IP .255). This makes for very clean boundaries and eight subnets of every specified size:
| CIDR | Every | IPs/Subnet |
| 192.168.{0,1,2,3,4,5,6,7}.0/24 | 1 | 254 |
| 192.168.{8,10,12,14,16,18,20,22}.0/23 | 2 | 510 |
| 192.168.{24,28,32,36,40,44,48,52}.0/22 | 4 | 1022 |
| 192.168.{56,64,72,80,88,96,104,112}.0/21 | 8 | 2044 |
| 192.168.{128,144,160,175,191,207,224,240}.0/20 | 16 | 4094 |
Another good one is 192.168.128.0/17, which is 32766 assignable hosts and leaves all of everything up to 128.0 alone.
Of course, these can be grouped entirely differently, on different boundaries, but this is nice to just grab one of a given size that you know starts and stops on a reasonable number.
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