Like its competitor , DNSAdvantage is based on closed - source software .
UltraDNS provides DNS services to many large corporations , such as Amazon.com , Gap , MySpace , LinkedIn and Oracle , The free service is in direct competition to OpenDNS .
Like UltraDNS 's competitor , UltraDNS is based on closed - source software .
UltraDNS provides DNS services to many large corporations , such as Amazon.com , Gap , MySpace , LinkedIn and Oracle , The free service is in direct competition to OpenDNS .