How can I ID what IPs a host uses?

If I want to locate what websites might be hosted by any given webhost, I thought I might first try to determine what IP range that webhost uses and then work from there.

So how can I figure out what IP addresses any given webhost owns?

And/or, is there a better/easier way for me to find an entire listing of websites that are hosted at any given webhost?
Thanks

 

 

 

 

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