In 1996-1998 he programmed and co-designed the Internet political art project namespace, which was designed to unstrain the Internet from special interest's control and expanded the artificial limitation of TLDs imposed on the Internet users by Network Solutions and IANA.
As Chief Technology Officer of Network Solutions and the manager of the Internet's master root server, Holtzman oversaw the growth of the commercial Internet from five hundred thousand to over twenty million domain names.
The project had a large number of sponsors including United Parcel Service, 3Com, Network Solutions, Piper Jaffray, Travelocity and Peapod.
During January, 2006, Network Solutions acquired e-commerce solutions company MonsterCommerce co-founded by Stephanie Leffler and Ryan Noble in Belleville, Illinois.
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A protracted and expensive lawsuit resulted as Gary Kremen, the legitimate owner at the time, worked to regain control.
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In March 2008, "Fitnathemovie.com", a website that Dutch politician Geert Wilders had reserved at Network Solutions, was taken offline.
In 2009, Rockbridge worked with Network Solutions and the University of Maryland, College Park to release the Small Business Success Index, which was featured on Fox News.
Nine Network | Cartoon Network | Seven Network | Showtime (TV network) | Network Ten | television network | CTV Television Network | GMA Network | USA Network | The Sports Network | Food Network | Trinity Broadcasting Network | Computer network | NFL Network | Home Shopping Network | DuMont Television Network | Network Rail | network | Global Television Network | American Forces Network | The Social Network | Dish Network | PlayStation Network | Big Ten Network | Christian Broadcasting Network | Game Show Network | Retro Television Network | Portable Network Graphics | Simple Network Management Protocol | Anime News Network |
These subdomains have been relatively popular and sold across a wide range of domain registrars globally, including Network Solutions, eNom, Webfusion, GMO, Gandi, Key Systems, Directi, InternetX, and many others.