It appears that it only does it for anything subdomainish -- that is, not the first part after the TLD. I tested it against .nz which has a silly mix of .{co,go

It appears that it only does it for anything subdomainish -- that is, not the first part after the TLD. I tested it against .nz which has a silly mix of .{co,govt,school}.nz second-level domains and directly registered example.nz domains and it always displays at least one "registered" bit. Which is almost worse because it seems like people have put thought into this.