IP falls in CIDR range

Question

I have an IP like this: 12.12.12.12
I\'m looping through different IP ranges (in 12.12.12.0/24 (example)) format, and trying to see if the IP is in the range.
I have t

Answer 1

Just test whether:

(ip & netmask) == (range & netmask)

You can determine the netmask from the CIDR parameters range/netbits as follows:

uint32_t netmask = ~(~uint32_t(0) >> netbits);