When you specify an IP address, you can use ‘implied address masks’ to specify an address range. If a specified IPv4 address has less than four octets, there is an implicit mask for the unspecified octets.
Example: 10.5 is interpreted to be the same as 10.5/16.
When specifying an address range, the implied mask only applies to the start address; if the end address has less than four octets, these are interpreted as the least significant octets and the omitted octet(s) are inherited from the start address.
Example: The address range 10.0.1-40 equates to 10.0.1.0-10.0.1.40.
You cannot specify an implied address mask for an IPv6 address.
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