Can anyone explain what this is?

http://directory.io/1#5HpHagT65TZzG1PH3CSu63k8DbpvD8s5ip4nEB3kEsreAbuatmU

Looks like someone has spent a lot of time generating addresses.

I checked about 5 of the addresses, weirdly one has been used in the past, possibly some kind of test (https://blockchain.info/address/1QAALUJNskZWEbvwKXoTteowgs9xGGeAZR)

No idea if the private keys are actual private keys.