IP address is 4 bytes unsigned integer with max value of 0xffffffff pluse value of 0. Another way to get the same result.

? 256 * 256 * 256 * 256

because each byte has value from 0 to 255.

>Thanks.
>
>But how did you come to that solution?
>
>Kev
>
>>>Not being renowned for my maths skills, how do you work out how many ip addresses you can have.
>>>
>>>Knowning the range is from 0.0.0.0 to 255.255.255.255.
>>>
>>>Thanks
>>>Kev
>>>
>>>BTW I thought it was 255 * 255 * 255 * 255!
>>
>>If you can use all of them, than

? 0xffffffff+1    &&  4,294,967,296