I was wondering if anyone knows more about a program named Subnet Tutor? Somebody in Cisco's forum recommended it highly. This person used this program to get their subnetting down to less than a minute per problem.
I was looking at its website: www.iscinc.com/SubnetTutor/. If I read its company's return policy correctly, all sales are final! I think that you can only use their demo for three questions. That is BAD since I want to know how it works and I need more that three questions to do it.
The administrator has disabled public write access.
If your just after a subnet calculator then www.net3group.com does a nice one where it will break down and show you all the subnets of in binary and decimal etc. No limit on use.
For learning purposes, this site is good and there is a stickied article outlining a subnetting method which can give you very fast times working out subnets by memorising a short table. I have been working with this and just need to remember 4 numbers in order to reproduce the entire table quickly. The sticky is here www.firewall.cx/ftopict-2145.html