When you specify an IP address, you can use ‘implied address masks’ to specify an address range. If a specified IP address has less than four octets, there is an implicit mask for the unspecified octets. for 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. For example, the address range 10.0.1-40 equates to 10.0.1.0-10.0.1.40.
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