in ip-addressing example 25.34.12.56 class ip address.but mean 25.34.12.56/16 , class ip address that?
that's "classless inter-domain routing" format, cidr , specifies both address , subnet bitmask.
the 16 means significant 16 bits of bitmask ones, corresponds mask of 255.255.0.0, class b
https://en.wikipedia.org/wiki/classless_inter-domain_routing
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