What is the largest address that you can have in IPv4?

The largest address in IPv4 is 255.255.255.255. This address is reserved for broadcasting to all hosts on a local network, and it represents the highest possible value for each of the four octets in the IPv4 address format. The total range of IPv4 addresses spans from 0.0.0.0 to 255.255.255.255, with the largest address being a special case used for broadcast purposes.