So, they apparently special-cased my router’s IPs (which I sent trace from), but my actual machine with NixOS seems unaffected by the change :-/ EDIT: http://ix.io/1iKy
What about fixing larger ranges? For IPv4 whois says the ISP has the whole 195.113.0.0/16 block (they should be all in CZ). For IPv6 whois says 2001:718::/32 but please at least the /64! I would think that Amazon technicians would figure out by themselves that /64 is co-located on the same continent, but apparently not.