Ask HN: Looking for historical ip whois data – suggestions?

I'm looking to process (for a research project) some historical access logs that record the ip. As part of that, I'm using the ip whois data to map each access to an the entity listed by the ip whois data (yes, there a lot of caveats there). I'm hoping to find a good source of historical ip whois data because the logs are old enough that some of the ips have changed ownership and so the ip whois data being returned isn't valid anymore. From my research, arin has a very rate limited whowas data, and apnic has a pretty good service, but only for their IPs (not sure if the arin service covers non-arin IPs). Are there any services that I'm missing? I'd love to find a good service with reasonable rate limit & api, even if it costs money. Or is this all there is?