A single IPv4 address is comprised of four sets of three numbers from 0 to 255, separated by periods. A single IPv6 address is comprised of eight sets of four hexidecimal numbers, separated by colons. An IP range includes all the addresses between two specified addresses. The addresses are separated by a hyphen. An IP address in CIDR notation is an IP address followed by a "prefix." The prefix notates a range of IP addresses without the need to type all the sets.