fwiw, I purchased a static block of IP from my net provider and I'm a 255.255.255.240 subnet.
can I 'get by' by faking it to pure class C? sort of. kinda sorta.
is it right to assume class C?
no. no it is not.
lets also talk about ISPs. my ISP has given me a .70 as my default router ('pro' level DSL from pacbell).
I happen to have a local gateway in my block of 5 or so addresses I can use but if I used their gw, it would be xx.xx.xx.70
so again, your code would not work on my home network using the ASSIGNED router that I get from pacbell.
I don't have a class C address and my router isn't .1
I guess the ard code is just not 'supposed' to work for folks like me, hmmm?
wow - the arduino codebase. we need a new slogan:
"well, it works FOR US..."
sheesh!