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UltraDNS provides DNS services to important names in the on-line 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 on-line industry like Oracle.com, LinkedIn.com, Myspace.com, Amazon.com, Gap.com, Diamond.com and others.  

The company has experienced some problems.  On 31 May 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 31 May 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>

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>