I think the first set of number [xxx for example given below] is specific to a country or an area.
ISPs usually assign dynamic IP numbers for their subscribers because they can rotate the numbers instead of having a large quantity of IP numbers fixed to specific users. In the numbers assigned by my ISP the first and second set of numbers dont change if I log off and reconnect.
You can trace the IP with this to get a geographical location.
ISP's get assigned blocks of IP addresses. ARIN records who they assign the blocks to and then you are able to trace the IP address not usually to the location of the customer where the ISP has assigned the IP address, but to the issuing office location.
For example. Shaw Cable Edmonton clients will all show as being Shaw Cable Calgary as that is where the H.O. is for Shaw Cable and from where the IP addresses get assigned.
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