Example methods and apparatus to collect broadband market data are disclosed. A disclosed example method includes selecting a panelist household, the panelist household subscribing to at least one broadband service delivered via a modem, and identifying an Internet protocol (IP) address assigned to the modem by an Internet service provider (ISP). The example method also includes retrieving a range of IP addresses associated with the ISP, selecting a random subset of IP addresses from the range of IP addresses, and testing each of the IP addresses from the random subset to determine an activity status of each IP address.