NetShelter, a vertical media network that sells advertising for technology websites, has raised $15 million in Series B funding led by Rho Ventures, with participation from existing investors Rho Canada and JLA Ventures. NetShelter says it will use the new funding, to expand internationally. The Toronto, Canada, based company previously raised $11.1 million.

NetShelter works with numerous categories of technology sites, including MacRumors.com, Slashgear.com, CrackBerry.com, ChipChick.com,  PhoneScoop.com, Experts-Exchange and more than 200 others.

The aggregate of sites represented attracted more than 133 million unique visitors in August, according to comScore.