http://serverfault.com/questions/164199/question-related-to-classful-ip-addressing-closed

I cannot believe that I'm still seeing questions about how to manage class-based routing coming in to ServerFault:

- http://serverfault.com/questions/145440/
- http://serverfault.com/questions/115503/
- http://serverfault.com/questions/145440/
- http://serverfault.com/questions/167390/ **New!**

and, of course this one:

- http://serverfault.com/questions/164240/

There's just some I found very quickly on the first page of a google search.

Most of these (apart from the last one) are because people just *don't understand CIDR routing* or are living in 1994. If you're 56 years old and have lived under a rock for the last 20 years - fine. What disgusts me is that some of these people are students and they are clearly being TAUGHT THIS AT SCHOOL. And not just as a theoretical exercise, but AS FACT.

I went to a pretty crappy university where in 2004 our lecturer tried to teach us about setting an IRQ on a network card in an ISA BUS (she somehow managed to find enough old computers for our tutorials so we actually had to do this!) and our database lecturer taught me nothing useful in two semesters except how to understand the thickest russian accent I've ever heard. But even we didn't learn about class-based IP addresses.

Should we bother answering these questions, or should we have one master "Class based IP addresses are DEAD and here is why" question/answer that we can link to and hit the close button?