HTTP Web Browser User Agent Identifier

What is my Web Browsers User Agent

Your web browsers user agent is identified as Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

What is a User Agent String and What's it for?

When any app (including a web browser) is communicating with a web server, it usually provides information that will help that web server provide the best experience for the user of the app. For example, if the user agent reveals to the web service that it is a mobile phone communicating with them (i.e. Mozilla/5.0 (iPhone; CPU iPhone OS 6_1_4 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10B350 Safari/8536.25) it will send a mobile friendly web page (smaller in size, loads faster ...) which would be totally different than a user agent string indicating the web browser is desktop based.

Downloadable List of Most Common User Agent Strings

You can download a list of dozens of the most common user agent strings. You can download the list in 3 different file formats:

1. user-agent-list-txt.txt
2. user-agent-list-csv.csv
3. user-agent-list-xls.xls

Spoofing your User Agent

Many peoples looking for lists of user agent strings are doing so for the purpose of spoofing or faking their user agent string. Why would anyone want to do this?

1. Most web services discourage automatic web services requesting software (call bots). There are several steps or methods to fool web services into thinking a bot is not a bot and one of these ways is by faking the user agent.
2. Access online data not normally allowed to the general public. An example of this is faking being a major search engine web crawler bot. Many websites allow search engine bots access to web pages the public would not normally be able to access. By faking being a search engine crawler bot via the appropriate user agent string, one may be able to access restricted web content in this manner.

While this technique MAY still work, most web hosts are aware of this trick so you may have to spoof your IP address to be that of the corresponding search engine web crawler IP address as well. If you have information about this feel free to leave this information within the comments section below.

Major Search Engine Web Crawler User Agent Strings

Not that we condone this method of online dishonesty, for your curiosity and use, here are the major search engine web crawler user agent string. Use at your own reward/risk. You can tell which search engine each of the user agents represent because their name is contained within the http user agent string.