Where can I get the list of gtld domains in redemption state (not pending delete)

Hello,
Is there any service that offers the list of gtld domains entering in redemption state?

I've been advised to scan all the .com/net/org/info zone to check the active domains, and for example 5 days laters, check it again. The difference of the two lists is the list of domains that have entered into redemption.
But I guess it would need huge resources to check millions of domains. Is there any other way to do it?