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I have a couple of test servers on Windows Azure. One is in the North Europe location and the other is in West Europe. I yet to get around to testing which location offers better connection speeds from where I am (London, UK).

The Northern Europe Azure datacentre is apparently in Ireland and the West Europe datacentre is in the Netherlands, which is weird in itself I think.

But what I am confused about are the IP addresses are both 168.63.xxx.xxx. GeoIP lookup says that they are both located in the US, and traceroute from London to the addresses get to the US before failing to respond pings.

What's going on?

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Azure has probably run out of US address space and is handing out adresses from different countries.

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  1. GeoIP isn't accurate for every IP address. MaxMind do take submissions, though, when you find an error.

  2. I tracerouted a random IP address in that subnet and wound up in Amsterdam. Without a specific IP address, or at least a traceroute output, I don't think anybody but Microsoft could say. And they'll ask for one or both of those, as well.

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    168.63.128.0/17 is advertised by AS8069 which seems to live in Asia, while 168.63.0.0/17 belongs to AS8075 does appear to head over the Europe.
    – Shane Madden
    Sep 11, 2012 at 2:52
  • Why didn't I think of that?
    – Michael Hampton
    Sep 11, 2012 at 2:53

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