ARIN, et al, provide WHOIS servers that will map IP address information to ASNs. The list of all registered ASNs is also public. Also, there are routing regis

ARIN, et al, provide WHOIS servers that will map IP address information to ASNs. The list of all registered ASNs is also public. Also, there are routing registries which can provide even more information on which ASNs announce which prefixes. Most of what you'd want is out there, but you might have to obtain it all and doing a bit of work to combine/correlate i all.