One of the biggest distributed denial of service (DDoS) attacks ever recorded hit CloudFlare's data centers in Europe on Monday, according to Tech Week Europe.

Few details about the attack have emerged, but CloudFlare CEO Matthew Prince posted on Twitter that it was probably close to 400Gbps in power, as it continues to investigate. The firm revealed the previous No. 1 DDoS attack last year, measuring in at just over 300Gbps, targeted at anti-spam outfit Spamhaus.

Prince declined to disclose the name of the CloudFlare customer being targeted. However, several outlets, including Forbes and Reuters report that Bitcoin was the target of the attacks.

The attackers used an increasingly common technique amongst DDoSers, which involves exploiting the UDP-based Network Timing Protocol. That protocol is normally used to sync clocks on machines, but attackers have discovered they can exploit a weakness that allows them to query an NTP server about connected clients and their traffic counts.

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