MasterCard.com was down for messing with WikiLeaks and Anonymous, but not Anonymous hackers. MasterCard was offline, and shortly after the outage was noticed by the public, someone on Twitter claimed credit. In a statement, MasterCard blamed the outage on an ISP issue, without discounting that they were attacked upstream. No cardholder data has been impacted and that cardholders can continue to use their cards securely. We are continuing to monitor the situation closely.,” spokeswoman Jennifer Stalzer said.
Source: https://thehackernews.com/2011/06/mastercard-downed-by-isp-not-anonymous.html