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I may be wrong on this because it's so early and no one is available on the phone to check, but I think the Department of Transport has fallen off the Internet due to a slight legacy oversight that has amused me this morning.
Currently the domain transport.gov.uk and dft.gov.uk do not appear to exist as resolvable addresses. My initial thought was that it was crappy cable connection to blame so I did some checking against a number of other ISPs (BT, Plusnet, Tiscali and the Joint Academic Network (which manages the gov.uk zone)) and got nothing.
It seems that as far as the Interweb is concerned, the server that tells you where the Department of Transport is for web, email etc are the following, dns0.odpm-dft.gov.uk, dns1.odpm-dft.gov.uk. Spot the oddity there? They are in a domain called "odpm-dft.gov.uk". That's going to be legacy back to when John Prescott was in charge of Transport (environment and the regions too).
The thing is, a quick query against JaNet say that there is no domain registered called odpm-dft.gov.uk. This means that no one on the Internet can find the servers which are supposed to hold the records for the DfT because they sit in a domain that doesn't exist. Could it be that someone thought "oh we don't need that legacy domain anymore, lets just let it expire" not realising that it was managing the current live DfT records?
One this is for sure, as far as the name resolution of the world is concerned, all the records for the DfT are looked after by two servers which have addresses in a domain that is no longer registered. It will be interesting to see if odpm-dft.gov.uk miraculously becomes registered again. Of course they might be in the process of moving the site to new nameservers which might also explain the outage.
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UPDATE 20:15: Just checked the domain record and it appears they updated the record today and changed the nameservers over to fix the problem.