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    <p>You said matching the user agent on ‘bot’ may be awkward, but we’ve found it to be a pretty good match. Our studies have shown that it will cover about 98% of the hits you receive. We also haven’t come across any false positive matches yet either. If you want to raise this up to 99.9% you can include a few other well-known matches such as ‘crawler’, ‘baiduspider’, ‘ia_archiver’, ‘curl’ etc. We’ve tested this on our production systems over millions of hits. </p> <p>Here are a few c# solutions for you:</p> <h3>1) Simplest</h3> <p>Is the fastest when processing a miss. i.e. traffic from a non-bot – a normal user. Catches 99+% of crawlers.</p> <pre><code>bool iscrawler = Regex.IsMatch(Request.UserAgent, @"bot|crawler|baiduspider|80legs|ia_archiver|voyager|curl|wget|yahoo! slurp|mediapartners-google", RegexOptions.IgnoreCase); </code></pre> <h3>2) Medium</h3> <p>Is the fastest when processing a hit. i.e. traffic from a bot. Pretty fast for misses too. Catches close to 100% of crawlers. Matches ‘bot’, ‘crawler’, ‘spider’ upfront. You can add to it any other known crawlers.</p> <pre><code>List&lt;string&gt; Crawlers3 = new List&lt;string&gt;() { "bot","crawler","spider","80legs","baidu","yahoo! slurp","ia_archiver","mediapartners-google", "lwp-trivial","nederland.zoek","ahoy","anthill","appie","arale","araneo","ariadne", "atn_worldwide","atomz","bjaaland","ukonline","calif","combine","cosmos","cusco", "cyberspyder","digger","grabber","downloadexpress","ecollector","ebiness","esculapio", "esther","felix ide","hamahakki","kit-fireball","fouineur","freecrawl","desertrealm", "gcreep","golem","griffon","gromit","gulliver","gulper","whowhere","havindex","hotwired", "htdig","ingrid","informant","inspectorwww","iron33","teoma","ask jeeves","jeeves", "image.kapsi.net","kdd-explorer","label-grabber","larbin","linkidator","linkwalker", "lockon","marvin","mattie","mediafox","merzscope","nec-meshexplorer","udmsearch","moget", "motor","muncher","muninn","muscatferret","mwdsearch","sharp-info-agent","webmechanic", "netscoop","newscan-online","objectssearch","orbsearch","packrat","pageboy","parasite", "patric","pegasus","phpdig","piltdownman","pimptrain","plumtreewebaccessor","getterrobo-plus", "raven","roadrunner","robbie","robocrawl","robofox","webbandit","scooter","search-au", "searchprocess","senrigan","shagseeker","site valet","skymob","slurp","snooper","speedy", "curl_image_client","suke","www.sygol.com","tach_bw","templeton","titin","topiclink","udmsearch", "urlck","valkyrie libwww-perl","verticrawl","victoria","webscout","voyager","crawlpaper", "webcatcher","t-h-u-n-d-e-r-s-t-o-n-e","webmoose","pagesinventory","webquest","webreaper", "webwalker","winona","occam","robi","fdse","jobo","rhcs","gazz","dwcp","yeti","fido","wlm", "wolp","wwwc","xget","legs","curl","webs","wget","sift","cmc" }; string ua = Request.UserAgent.ToLower(); bool iscrawler = Crawlers3.Exists(x =&gt; ua.Contains(x)); </code></pre> <h3>3) Paranoid</h3> <p>Is pretty fast, but a little slower than options 1 and 2. It’s the most accurate, and allows you to maintain the lists if you want. You can maintain a separate list of names with ‘bot’ in them if you are afraid of false positives in future. If we get a short match we log it and check it for a false positive.</p> <pre><code>// crawlers that have 'bot' in their useragent List&lt;string&gt; Crawlers1 = new List&lt;string&gt;() { "googlebot","bingbot","yandexbot","ahrefsbot","msnbot","linkedinbot","exabot","compspybot", "yesupbot","paperlibot","tweetmemebot","semrushbot","gigabot","voilabot","adsbot-google", "botlink","alkalinebot","araybot","undrip bot","borg-bot","boxseabot","yodaobot","admedia bot", "ezooms.bot","confuzzledbot","coolbot","internet cruiser robot","yolinkbot","diibot","musobot", "dragonbot","elfinbot","wikiobot","twitterbot","contextad bot","hambot","iajabot","news bot", "irobot","socialradarbot","ko_yappo_robot","skimbot","psbot","rixbot","seznambot","careerbot", "simbot","solbot","mail.ru_bot","spiderbot","blekkobot","bitlybot","techbot","void-bot", "vwbot_k","diffbot","friendfeedbot","archive.org_bot","woriobot","crystalsemanticsbot","wepbot", "spbot","tweetedtimes bot","mj12bot","who.is bot","psbot","robot","jbot","bbot","bot" }; // crawlers that don't have 'bot' in their useragent List&lt;string&gt; Crawlers2 = new List&lt;string&gt;() { "baiduspider","80legs","baidu","yahoo! slurp","ia_archiver","mediapartners-google","lwp-trivial", "nederland.zoek","ahoy","anthill","appie","arale","araneo","ariadne","atn_worldwide","atomz", "bjaaland","ukonline","bspider","calif","christcrawler","combine","cosmos","cusco","cyberspyder", "cydralspider","digger","grabber","downloadexpress","ecollector","ebiness","esculapio","esther", "fastcrawler","felix ide","hamahakki","kit-fireball","fouineur","freecrawl","desertrealm", "gammaspider","gcreep","golem","griffon","gromit","gulliver","gulper","whowhere","portalbspider", "havindex","hotwired","htdig","ingrid","informant","infospiders","inspectorwww","iron33", "jcrawler","teoma","ask jeeves","jeeves","image.kapsi.net","kdd-explorer","label-grabber", "larbin","linkidator","linkwalker","lockon","logo_gif_crawler","marvin","mattie","mediafox", "merzscope","nec-meshexplorer","mindcrawler","udmsearch","moget","motor","muncher","muninn", "muscatferret","mwdsearch","sharp-info-agent","webmechanic","netscoop","newscan-online", "objectssearch","orbsearch","packrat","pageboy","parasite","patric","pegasus","perlcrawler", "phpdig","piltdownman","pimptrain","pjspider","plumtreewebaccessor","getterrobo-plus","raven", "roadrunner","robbie","robocrawl","robofox","webbandit","scooter","search-au","searchprocess", "senrigan","shagseeker","site valet","skymob","slcrawler","slurp","snooper","speedy", "spider_monkey","spiderline","curl_image_client","suke","www.sygol.com","tach_bw","templeton", "titin","topiclink","udmsearch","urlck","valkyrie libwww-perl","verticrawl","victoria", "webscout","voyager","crawlpaper","wapspider","webcatcher","t-h-u-n-d-e-r-s-t-o-n-e", "webmoose","pagesinventory","webquest","webreaper","webspider","webwalker","winona","occam", "robi","fdse","jobo","rhcs","gazz","dwcp","yeti","crawler","fido","wlm","wolp","wwwc","xget", "legs","curl","webs","wget","sift","cmc" }; string ua = Request.UserAgent.ToLower(); string match = null; if (ua.Contains("bot")) match = Crawlers1.FirstOrDefault(x =&gt; ua.Contains(x)); else match = Crawlers2.FirstOrDefault(x =&gt; ua.Contains(x)); if (match != null &amp;&amp; match.Length &lt; 5) Log("Possible new crawler found: ", ua); bool iscrawler = match != null; </code></pre> <p><strong>Notes:</strong></p> <ul> <li>It’s tempting to just keep adding names to the regex option 1. But if you do this it will become slower. If you want a more complete list then linq with lambda is faster.</li> <li>Make sure .ToLower() is outside of your linq method – remember the method is a loop and you would be modifying the string during each iteration.</li> <li>Always put the heaviest bots at the start of the list, so they match sooner.</li> <li>Put the lists into a static class so that they are not rebuilt on every pageview.</li> </ul> <p><strong>Honeypots</strong></p> <p>The only real alternative to this is to create a ‘honeypot’ link on your site that only a bot will reach. You then log the user agent strings that hit the honeypot page to a database. You can then use those logged strings to classify crawlers.</p> <p><code>Postives:</code> It will match some unknown crawlers that aren’t declaring themselves.</p> <p><code>Negatives:</code> Not all crawlers dig deep enough to hit every link on your site, and so they may not reach your honeypot.</p>
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