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UltraDNS provides [[DNS]] services to important names in the online industry like [[Oracle.com]], [[LinkedIn.com]], [[Myspace.com]], Amazon.com, Gap.com, Diamond.com, and others.  

UltraDNS provides [[DNS]] services to important names in the online industry like [[Oracle.com]], [[LinkedIn.com]], [[Myspace.com]], Amazon.com, Gap.com, Diamond.com, and others.  

The company has experienced some problems.  On May 31st, 2009, [[NetworkWorld]] reported that a number of important websites which used the services of UltraDNS, including Petco.com, Advertising.com, SalesForce.com and Amazon.com, experienced downtime of up to a couple of hours, due to a Distributed Denial of Service ([[D-Dos]]) attack.<ref>[http://www.networkworld.com/news/2009/033109-ultradns-service-attacked.html Some UltraDNS customers knocked offline by attack]</ref> A similar report appeared on the [[ZDNet]] blog.<ref>[http://www.zdnet.com/blog/btl/ddos-attack-on-ultradns-affects-amazoncom-salesforcecom-petcocom/15601 DDoS attack on UltraDNS affects Amazon.com, SalesForce.com, Petco.com]</ref> This was quite a hit to the company as they claim that their services also "protect your customers’ Web operations from DNS-based [[DDoS]] attacks and pharming attacks from [[DNS]] cache poisoning. Our redundant infrastructure means no single point of failure."<ref>[http://www.neustarreferrals.biz/ultradns-r UltraDNS on NeuStar]</ref>

The company has experienced some problems.  On May 31st, 2009, [[NetworkWorld]] reported that a number of important websites which used the services of UltraDNS, including Petco.com, Advertising.com, SalesForce.com and Amazon.com, experienced downtime of up to a couple of hours, due to a [[DDoS|Distributed Denial of Service]] attack.<ref>[http://www.networkworld.com/news/2009/033109-ultradns-service-attacked.html Some UltraDNS customers knocked offline by attack]</ref> A similar report appeared on the [[ZDNet]] blog.<ref>[http://www.zdnet.com/blog/btl/ddos-attack-on-ultradns-affects-amazoncom-salesforcecom-petcocom/15601 DDoS attack on UltraDNS affects Amazon.com, SalesForce.com, Petco.com]</ref> This was quite a hit to the company as they claim that their services also "protect your customers’ Web operations from DNS-based [[DDoS]] attacks and pharming attacks from [[DNS]] cache poisoning. Our redundant infrastructure means no single point of failure."<ref>[http://www.neustarreferrals.biz/ultradns-r UltraDNS on NeuStar]</ref>

UltraDNS also experienced trouble in 2006, when due to [[DDoS]] attacks targeting them, a number of websites that used the services of [[Prolexic]], a company specialized in protecting websites from [[DDoS]] attacks, experienced heavy downtime, including the famous [[Blue Security]] website of their anti-spam product Blue Frog. Brian Krebs of The Washington Post reported that due to the fact that Prolexic used [[DNS]] services from UltraDNS, the attack was concentrated on UltraDNS resulting in the Blue Frog website going down.<ref>[http://voices.washingtonpost.com/securityfix/2006/05/blue_security_surrenders_but_s.html Blue Security Kicked While It's Down]</ref>

UltraDNS also experienced trouble in 2006, when due to [[DDoS]] attacks targeting them, a number of websites that used the services of [[Prolexic]], a company specialized in protecting websites from [[DDoS]] attacks, experienced heavy downtime, including the famous [[Blue Security]] website of their anti-spam product Blue Frog. Brian Krebs of The Washington Post reported that due to the fact that Prolexic used [[DNS]] services from UltraDNS, the attack was concentrated on UltraDNS resulting in the Blue Frog website going down.<ref>[http://voices.washingtonpost.com/securityfix/2006/05/blue_security_surrenders_but_s.html Blue Security Kicked While It's Down]</ref>