Root zone is an empty label, rendered in packet as 0x00h. The label contains a length of the label, the root zone length is NULL, none, zero, or "". We use dot

Root zone is an empty label, rendered in packet as 0x00h. The label contains a length of the label, the root zone length is NULL, none, zero, or "". We use dot "." to split labels. wwww.example.com has 4 labels: "www" . "example" . "com" . "" (NULL, root label, 0 length). Because we can't print NULL/"", it looks like a single dot at the end. But this single dot separate com from root label, which is empty "". We ommit this label and this dot.