My continued series of questions on IP addresses (ref Q1 and Q2).
There are several IP address to location services. For instance: http://www.ip-adress.com/ip_tracer/ and http://www.ip2location.com/demo.aspx . How do they collect their data? (i.e. mail surveys [yeah, probably not], tech-mobiles driving around and gathering information) What data do they usually gather?