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Get IP's in Autonomous System Number (ASN)

I've tried getting the list of IP's under an ASN number for example AS8167 however I am having no such luck. I have seen that team cymru have an IP to ASN, however that is the opposite of what I actually need.

RADb has a whois server that provides this functionality. It includes information other than just the IP blocks, so you'll need to grep for those if that's all you're interested in:

$ whois -h whois.radb.net -- '-i origin AS8167' | grep -Eo "([0-9.]+){4}/[0-9]+" | head
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