The Domain Survey attempts to discover every host on the Internet by doing a complete search of the allocated address space and following links to domain names. It is sponsored by Internet Systems Consortium, Inc. with technical operations subcontracted to 3waylabs. Survey data is collected and published quarterly. If you are interested in an e-mail notification for new surveys, please click here for our mailing list manager.
The most recent survey available online is dated July 2018. Complete ISC Domain Survey results, in-depth data, and information are available for purchase at the ISC store. Data for January 2018 is flawed and is included here for amusement purposes only. We have not finished researching the 5% drop from July 2017 to July 2018 but we tentatively believe that it is the result of some ISPs moving their customers to IPv6.