Being a complete novice, I can't offer anything else other than the very strong suspicion that this is not correct and the weaker suspicion that it arises from conflation of the concepts domain (conserved protein sequence) and domain (internet resource).
The DBpedia ontology classifies internet Country Code Top-Level Domains as entities of type "Protein":
http://dbpedia.org/page/Country_code_top-level_domain
Being a complete novice, I can't offer anything else other than the very strong suspicion that this is not correct and the weaker suspicion that it arises from conflation of the concepts domain (conserved protein sequence) and domain (internet resource).