Netmask question

[Ferenc Tamas Gyurcsan]

Hi,
A question came up, and I can't find the answer neither in the rfc's, nor
in the faq. So is it possible to have a netmask that's not contigous? I
mean that in the end for example something like this:
.11000011
So it would describe 255.255.255.195. Where can I find info about this? An
rtfm answer would be great, showing which fm. Somewhere I read it was
possible, and many people said it wasn't.

Thanks,
Ferenc