A number of major websites -- including Vodafone's Group website -- were disrupted yesterday after an apparently Turkish group of hackers were able to break the DNS server that underpins them.

When you type in a website address, your ISP looks up the underlying IP address of the website via a DNS service. If that is compromised, then it might send back the wrong IP address -- which is what appears to have happened in this case.

None of the company's actual websites were directly targeted by the...
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