I wrote about programs and scripts doing IPv4 subnet calculation, but sometimes it is easier to have a table at hand, so here is the one I found at [Wayback/Archive] OccupytheWeb on Twitter: “Network Basics for Hackers: Subnetting, Subnet Masks and CIDR Notation #networks #networkbasics #subnetting #infosec #networks4hackers #cyberwarrior #cyberwarrior #networkbasics #networkbasics subnet”
Notes:
- it is by far original, as a quick image search revealed lots of other sources, for instance the 2011 post [Wayback/Archive] Subnet Mask Quick Reference | Academic PCs Blog
- there is a much better table below adapted from Classless Inter-Domain Routing: IPv4 CIDR blocks – Wikipedia
The Wiert Corner - irregular stream of stuff 