For a more complete domain name database, the Internet Systems Consortium offers a Domain Survey Dataset with the full domain name for every IP address.

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Purchase Site License [?]		With Updates
Downloadable Database: $100/site license, includes first month of updates.		$100 site license fee and $24 per month of updates. First month update fee included in one time fee. You may cancel your subscription at any time.

Product Features - MaxMind GeoIP Domain Name Database

Updated monthly Includes unlimited e-mail support Site license (all machines within organization) Includes the following fields: Start IP Number End IP Number Domain Name Approximately 224,000 records. Open Source binary API available for the following languages: C PHP (Pure) Java Perl (XS) Apache Python MS COM C# Pascal For performance details, see our benchmark page Automated updates for binary API database using geoipupdate on Linux/Unix, included in C API Availability Once your order has been processed you will be able to download the data in any one of the following formats: Optimized binary file for usage in APIs. We recommend using the binary files with APIs instead of importing the CSV files into SQL because the binary format is more efficient and is easy to set up and use. We have APIs for both Linux/Unix and Windows. Comma-separated values (Sample data) Please allow 1-3 hours to process your order during US business hours, or up to 12 hours outside of US business hours. If we require additional information to verify the order is coming from an established company, the processing make take longer. Product Requirements Uncompressed Disk Space: Optimized binary file for usage in APIs. We recommend using the binary files with APIs instead of importing the CSV files into SQL because the binary format is more efficient and is easy to set up and use. We have APIs for both Linux/Unix and Windows. - 5 MB Comma-separated values - 8 MB For CSV Files format - WinZip or another similar PKzip archive extraction utility Binary/API Format - gunzip/tar archive extraction utility Database Fields Field Data Type Field Description Start IP Number unsigned int First IP in netblock, numeric representation. End IP Number unsigned int Last IP in netblock, numeric representation. Domain Name varchar(255) Top/Second Level Domain Name Disclaimer: The database contains our best estimate for the domain name for every IP address, but may not be accurate or complete in all cases. We sample each /24 block to determine the domain name for the block of 256 IP addresses, which works when the domain name is the same across a given block. For example, the domain for 24.24.24.0 - 24.24.24.225 is rr.com. This typically works when the IP addresses are allocated to an ISP. However for colocated web servers, this may not work since each IP address may be assigned to a different domain within a /24 block. Please try the demo before purchasing.