Final answer:
There are 2,097,152 Class C networks specified within IPv4.
Step-by-step explanation:
The number of Class C networks specified within IPv4 is 2,097,152.
In IPv4, the address space is divided into classes, with each class having a different number of network bits and host bits. Class C networks have a default subnet mask of 255.255.255.0, which allows for 256 IP addresses per network. There are 256 possible values for the last octet in the Class C address, resulting in a total of 2,097,152 Class C networks.