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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.
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Autonomous System Numbers (ASNs)An IP prefix is a list of IP addresses that can be reached from that ISP's network. The network operators must have an ASN to control routing within their networks and to exchange routing information with other ISPs.
ASN Lookup An AS is a connected group of one or more IP prefixes run by one or more network operators which has a SINGLE and CLEARLY DEFINED routing policy. This number is used in both the exchange of exterior routing information (between neighboring ASes), and as an identifier of the AS itself.
To obtain an ASN, you'll have to become a member with RIPE NCC or, alternatively, you can have a sponsoring local internet registry submit the request for you. Note that a new ASN number should only be requested if there is a requirement for a new external routing policy.
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
189.11.64.0/18
189.31.0.0/16
189.72.128.0/18
189.73.192.0/18
189.74.0.0/18
189.74.64.0/18
189.64.0.0/11
189.0.0.0/11
187.52.192.0/18
187.52.0.0/17
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