A bunch of things that aren't code; plus a wiki for various musings
This paper describes a DNS solution I created to meet a very specific need in a multi-architecture build environment with a complex network arrangement.
Another paper about the multi-architecture environment. This time, I'm describing BOOTP and configuration of dhcpd in support of multi-architecture builds.
A decade or so ago I chanced across this table and have never been able to re-locate this exact source; others are similar, but never an exact match (I also lost the original file, so I don't even know the name). In any event, given an IPv4 Class C address space, it shows the possible subnets that can be created (neglecting the last 2 bits, of course). I re-created it in LibreOffice Calc and added the slash notation.
A little bit of whimsey, in the spirit of RFC 1121