Los Angeles-based Oversee.net announced today that it has purchased a portfolio of 35,000 domain names. The firm, which runs online advertising and search engine optimization and other businesses, did not disclose the purchase price. Oversee.net operates online lead generation, advertising, and other businesses, including its own domain monetization firm DomainSponsor. DomainSponsor serves domain name owners, who park their domain names at the firm's web site and share advertising revenues from visits.