List of All User Agents for Top Search Engines

Here is a working list of all user agents for the top search engines. I use this information frequently for my plugins such as Blackhole for Bad Bots and BBQ Pro, so I figured it would be useful to post the information online for the benefit of others. Having the user agents for these popular bots all in one place helps to streamline my development process. Each search engine includes references and a regex pattern to match all known user agents. Read more »