Maybe my experience has been a little bit sheltered, but something in my new role has been bothering me for a while - I just thought I'd share and see if anyone else finds it odd. We are a US/UK company - we manage our own local domain namespace in the forest, including some forward lookup zones for internal web services and the like. Nothing wrong with that - and certainly nothing that I haven't seen before - except that, in addition to the usual 'local' domains & subdomains we also have an internal forward lookup zone configured for what should be a fully resolvable external domain. To illustrate this better, I've set out what our Nameservers hold here: uk.mycompany.local - dev.mycompany.local - admin.mycompany.local - dev.lon.mycompany.co.uk Now that would normally set alarm bells ringing for me, but the domain isn't resolvable from external DNS, and is used purely for internal access to some development web servers (believe me I've tested it!). Anybody else think this is just a tad odd, or have I just come across something that is regularly implemented elsewhere for the first time myself? I only ask really because today I had to set up resolution of a server on the 'oddball' domain for some of our US users - which required conditional forwarding to be set up for this domain on the US nameservers pointing to the authoritative server for the forward lookup zone.