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Finding IP Ranges


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I am doing some research and need some technical help. Say, for example, that there is an ISP that I am looking into. When I do an ARIN lookup on the ISP name, it returns an "AS" number like AS12345.

What I want to know is all the IPs that are available/assigned to that ISP. So, is it possible for me to search all IPs belonging to an AS?

Thanks in advance for your time and help.

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Some (alternative) tools that may help get you somewhere near the information you are after -




Have a play with those and see how you go. For instance, feeding ISP names into senderbase will produce lists of IP addresses used for outwards mail (as seen by SB).

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