Johannes, Executive Chef at the Storm Center has a post on researchers that scan the internet.
It includes 30 different entities, including well known internet census service providers shodan, censys, and shadowserver.
isc.sans.edu/diary/Update%3A%20Researchers%20scanning%20the%20Internet/30102
It includes 30 different entities, including well known internet census service providers shodan, censys, and shadowserver.
isc.sans.edu/diary/Update%3A%20Researchers%20scanning%20the%20Internet/30102