The last couple of days one of the forums that I frequent and a few other sites I use have been offline because of this... and it's still ongoing..... 
http://www.pcworld.com/article/2040766/possibly-related-ddos-attacks-cause-dns-hosting-outages.html

Quote
Possibly related DDoS attacks cause DNS hosting outages
06.04.2013 1:05 PM
Distributed denial-of-service (DDoS) attacks that could be related have, in
the past few days, slammed the DNS servers of at least three providers of
domain name management and DNS hosting services.
http://www.pcworld.com/article/2040766/possibly-related-ddos-attacks-cause-dns-hosting-outages.html






