Interestingly, only my landline broadband connection blocks them (Aussie Broadband), not my mobile provider (Telstra, Optus)!
EDIT: contacted Aussie since it looks like they've forgotten to unblock it.
EDIT: Not related to blocking - turns out archive.today returns invalid IP when queries by Cloudflare DNS resolvers (which I use): https://en.wikipedia.org/wiki/EDNS_Client_Subnet#Controversy...