It's already being proposed by one of my colleagues. See: https://tools.ietf.org/html/draft-wkumari-dnsop-internal-00 https://tools.ietf.org/html/draft-wkumari

It's already being proposed by one of my colleagues. See: https://tools.ietf.org/html/draft-wkumari-dnsop-internal-00 https://tools.ietf.org/html/draft-wkumari-dnsop-internal-00 It does seem much, much more likely that .internal will be definitely reserved for this purpose than that it will ever be delegated as an actual real TLD. If you have to pick a fake TLD to use that isn't one of the 4 mentioned in RFC 2606 that has the best chance of actually being reserved for this purpose in the future, then .internal is it.