An IPv6 address is made of 8 groups of 16-bit hexadecimal values separated by colons as in 2001:0db8:85a3:0000:0000:8a2e:0370:7334.
IPv6 addresses can be abbreviated by omitting leading zeroes in 16-bit values and by replacing each group of consecutive zeroes by a double colon. As such, 2001:0db8:85a3:0000:0000:8a2e:0370:7334 is equivalent to 2001:db8:85a3::8a2e:370:7334.
An IPv6 address range must conform to one of the following forms:
*: the range includes all valid IP addresses,
ipA-ipB: the range includes the IPv6 addresses between ipA and ipB,
ipA/n: the range includes all the IPv6 addresses which first n bits are identical to the first n bits of ipA,
ipA-ipB/n: An IPv6 address that is included in this range is comprised between ipA and ipB, and has its first n bits identical to the first n bits of ipA and ipB.