Here is a resource I found helpful a while back (like in '99).
http://www.3com.com/other/pdfs/infra/corpinfo/en_US/501302.pdf(Not exactly a cheat sheet, but something a bit more comprehensive that will help you quickly understand a cheat sheet.)
Another great subnetting tool I like is this: http://apps.csc.fi/laskin2.htmlThe other week I was planning out some subnets for some VLANs for the fire, PD, and SWAT teams for wireless roaming, and I to figure out which subnets would neatly encompass the ranges I needed.
So, say you need to find out which subnets to use to get the range 192.168.1.0 - 192.168.5.128. You'd punch in both addresses in that calc and get the following output
192.168.1.0/255.255.255.0 192.168.1.0/0.0.0.255 192.168.1.0/ 24 192.168.2.0/255.255.254.0 192.168.2.0/0.0.1.255 192.168.2.0/ 23 192.168.4.0/255.255.255.0 192.168.4.0/0.0.0.255 192.168.4.0/ 24 192.168.5.0/255.255.255.128 192.168.5.0/0.0.0.127 192.168.5.0/ 25 192.168.5.128/255.255.255.255 192.168.5.128/0.0.0.0 192.168.5.128/ 32
smime.p7s
Description: S/MIME Cryptographic Signature
