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Where "cidr_block" is an

Output

object that'll eventually return a string:

cidr_block.apply(lambda value: ip_network(cidr_block).subnets(prefixlen_diff=2))

This will return an Output object that will eventually return a List[IPv6Network] object, where each IPv6Network is a subnet of cidr_block that's 1/4 the original size

Thanks! I had to massage it a bit to make it output a list instead of a generator, but it got me there in the end 👍