- HTTP User Agent Index
An alphabetical list of user agents and the deployer behind them, compiled by Christoph Rüegg.
http://www.siteware.ch/webresources/useragents/db.html
- List of Robot Agent Strings
A list from PGTS of Web robots with the identifying data they leave in Web site logs.
http://www.pgts.com.au/pgtsj/pgtsj0208d.html
- Psychedelix List of User-Agents
Andreas Staeding's large list of search engine spiders, similar Web robots, and Web browsers: their web-log identification and links to their originators.
http://www.psychedelix.com/agents.html
- Search Engine IP Addresses
Lists IP addresses of search engine spiders. Can be searched by IP address. Also links to resources on spiders.
http://www.iplists.com/
- Search Engine Robots and Other User Agents
John A. Fotheringham presents data in tabular form on the robots sent by search engines and other sites to read and index Web pages: their origins, names and IP addresses.
http://www.jafsoft.com/searchengines/webbots.html
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