Hackers have attacked the network used by the organisation that oversees the 'net.
The organisation, ICANN, said spoofed emails were used to reach an internal network and the attackers used the access to steal lists of contact and login information for people who control some of the 'net's most popular domains.
The attack took place in November. ICANN said it had notified people that their data may have gone astray and asked them to change their passwords.
Icann (Internet Corporation for Assigned Names and Numbers) was set up to oversee the underlying addressing system that keeps the 'net running and ensures data gets where it's supposed to go.
ICANN said some of its staff was tricked into opening booby-trapped email messages that were sent by attackers and crafted to look like they were sent from other employees.
The emails enabled the attackers to capture login names and passwords for ICANN's international network.
ICANN said it had now put in place more stringent security systems to prevent another breach.
It added: "Based on our investigation to date, we are not aware of any other systems that have been compromised."
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