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2010 User-Agent Blacklist

[ 2010 User-Agent Blacklist ] The 2010 User-Agent Blacklist blocks hundreds of bad bots while ensuring open-access for the major search engines: Google, Bing, Ask, Yahoo, et al. Blocking bad user-agents is an effective addition to any security strategy. It works like this: your site is getting hammered by rogue bots that waste valuable server resources and bandwidth. So you grab a copy of the 2010 UA Blacklist from Perishable Press, include it in your site’s root .htaccess file, and enjoy better security and performance. It’s that easy.

Update: Check out the new and improved 2013 User Agent Blacklist!

Proven Security

The 2010 UA Blacklist has been carefully constructed based on rigorous server-log analyses. Obsessive daily log monitoring reveals bad bots scanning for exploits, spamming resources, and wasting bandwidth. While analyzing malicious behavior, evil bots are identified and added to the UA Blacklist. Blocked user-agents are denied access to your site, increasing efficiency and providing safety for your visitors.

Better Performance, Better SEO

Search engines such as Google are placing more weight on speedy, fast-loading websites. If your site is plagued with resource-devouring, bandwidth-wasting bots, it’s performance is probably not as good as it should be. Even if your site looks fine on the surface, without proper protection bad bots can gobble your bandwidth and leech your server resources. A single malicious bot can make hundreds and thousands of requests in a very short period of time while scanning and probing for vulnerabilities. If Google visits while bad bots are hitting your site, your site’s SEO could suffer. Fortunately, the 2010 UA Blacklist protects your site against hundreds of nefarious bots, thereby fostering maximum performance for the search engines.

2010 User-Agent Blacklist

Here it is, presented as two sets of HTAccess directives:

RewriteCond %{HTTP_HOST} !^(127\.0\.0\.0|localhost) [NC]
RewriteCond %{HTTP_USER_AGENT} .*(Firs|exac|Cloak|Detect|uchoo|beaut|ASPSeek|swish|ICS\)|MSIE\ 6\.0\;\ Windows\ NT\;\ DigExt\)|pt\-BR\;\ rv\:1\.9\.0\.3\)\ Firefox\/3\.0|pt\-BR\;\ rv\:1\.9\.0\.18\)\ Firefox\/3\.0|\!susie|\$x0e|\%0a|\%0d|\@\$x|\_irc|\_works|\+select\+|\+union\+|\<\?|1\,\1\,1\,|3gse|4all|4anything|5\.1\;\ xv6875\)|59\.64\.153\.|85\.17\.|88\.0\.106\.|98|a\_browser|a1\ site|abac|abach|abby|aberja|abilon|abont|abot|accept|access|accoo|accoon|aceftp|acme|active|address|adopt|adress|advisor|agent|ahead|aihit|aipbot|alarm|albert|alek|alexa\ toolbar\;\ \(r1\ 1\.5\)|alltop|alma|alot|alpha|america\ online\ browser\ 1\.1|amfi|amfibi|anal|andit|anon|ansearch|answer|answerbus|answerchase|antivirx|apollo|appie|arach|archive|arian|aboutoil|asps|aster|atari|atlocal|atom|atrax|atrop|attrib|autoh|autohot|av\ fetch|avsearch|axod|axon|baboom|baby|back|baid|bali|bandit|barry|basichttp|batch|bdfetch|beat|become|bee|beij|betabot|biglotron|bilgi|bison|bitacle|bitly|blaiz|blitz|blogl|blogscope|blogzice|bloob|blow|bord|boi|bond|boris|bost|bot\.ara|botje|botw|bpimage|brand|brok|broth|browseabit|browsex|bruin|bsalsa|bsdseek|built|bulls|bumble|bunny|busca|busi|buy|bwh3|cafek|cafi|camel|cand|captu|casper|catch|ccbot|ccubee|cd34|ceg|cfnetwork|cgichk|cha0s|chang|chaos|char|char\(|chase\ x|check\_http|checker|checkonly|chek|chill|chttpclient|cipinet|cisco|cita|citeseer|clam|claria|claw|clush|coast|code\.com|cogent|coldfusion|coll|collect|comb|combine|commentreader|common|compan|compatible\-|conc|conduc|contact|control|contype|conv|cool|copi|copy|coral|corn|cosmos|costa|cowbot|cr4nk|craft|cralwer|crank|crap|crawler0|crazy|cres|cs\-cz|cshttp|cuill|CURI|curl|curry|custo|cute|cyber|cz3|czx|daily|dalvik|daobot|dark|darwin|data|daten|dcbot|dcs|dds\ explorer|deep|deps|detect|dex|diam|diibot|dillo|ding|disc|disp|ditto|dlc|doco|dotbot|drag|drec|dsdl|dsok|dts|duck|dumb|eag|earn|earthcom|easydl|ebin|echo|edco|egoto|elnsb5|email|emer|empas|encyclo|enfi|enhan|enterprise\_search|envolk|erck|erocr|eventax|evere|evil|ewh|exploit|expre|extra|eyen|fang|fast|fastbug|faxo|fdse|feed24|feeddisc|feedhub|fetch|filan|fileboo|fimap|find|firebat|firedownload\/1\.2pre\ firefox\/3\.6|firefox\/0|firefox\/2|firs|flam|flash|flexum|flip|fly|focus|fooky|forum|forv|fost|foto|foun|fount|foxy\/1\;|free|friend|frontpage|fuck|fuer|futile|fyber|gais|galbot|gbpl|gecko\/2001|gecko\/2002|gecko\/2006|gecko\/2009042316|gener|geni|geo|geona|geth|getr|getw|ggl|gira|gluc|gnome|go\!zilla|goforit|goldfire|gonzo|google\ wireless|googlebot\-image|gosearch|got\-it|gozilla|grab|graf|greg|grub|grup|gsa\-cra|gsearch|gt\:\:www|guidebot|guruji|gyps|haha|hailo|harv|hash|hatena|hax|head|helm|herit|heritrix|hgre|hippo|hloader|hmse|hmview|holm|holy|hotbar\ 4\.4\.5\.0|hpprint|httpclient|httpconnect|httplib|human|huron|hverify|hybrid|hyper|iaskspi|ibm\ evv|iccra|ichiro|icopy|ida|ie\/5\.0|ieauto|iempt|iexplore\.exe|ilium|ilse|iltrov|indexer|indy|ineturl|infonav|innerpr|inspect|insuran|intellig|interget|internet\_explorer|internet\x|intraf|ip2|ipsel|irlbot|isc\_sys|isilo|isrccrawler|isspi|jady|jaka|jam|jenn|jet|jiro|jobo|joc|jupit|just|jyx|jyxo|kash|kazo|kbee|kenjin|kernel|keywo|kfsw|kkma|kmc|know|kosmix|krae|krug|ksibot|ktxn|kum|labs|lanshan|lapo|larbin|leech|lets|lexi|lexxe|libby|libcrawl|libcurl|libfetch|libweb|libwww|light|linc|lingue|linkcheck|linklint|linkman|lint|list|litefeeds|livedoor|livejournal|liveup|lmq|locu|london|lone|loop|lork|lth\_|lwp|mac\_f|magi|magp|mail\.ru|main|majest|mam|mama|mana|marketwire|masc|mass|mata|mvi|mcbot|mecha|mechanize|mediapartners|metadata|metalogger|metaspin|metauri|mete|mib\/2\.2|microsoft\.url|microsoft\_internet\_explorer|mido|miggi|miix|mindjet|mindman|mips|mira|mire|miss|mist|mizz|mj12|mlbot|mlm|mnog|moge|moje|mooz|more|mouse|mozdex) [NC]
RewriteRule ^.*$ - [G]

RewriteCond %{HTTP_HOST} !^(127\.0\.0\.0|localhost) [NC]
RewriteCond %{HTTP_USER_AGENT} .*(Windows\ NT\ 6\.1\;\ tr\;\ rv\:1\.9\.2\.6\)|mozilla\/0|mozilla\/1|mozilla\/2|mozilla\/3|mozilla\/4\.61\ \[en\]|mozilla\/firefox|mpf|msie\ 1|msie\ 2|msie\ 3|msie\ 4|msie\ 5|msie\ 6\.0\-|msie\ 6\.0b|msie\ 7\.0a1\;|msie\ 7\.0b\;|msie6xpv1|msiecrawler|msnbot\-media|msnbot\-products|msnptc|msproxy|msrbot|musc|mvac|mwm|my\_age|myapp|mydog|myeng|myie2|mysearch|myurl|nag|name|naver|navr|near|netants|netcach|netcrawl|netfront|netinfo|netmech|netsp|netx|netz|neural|neut|newsbreak|newsgatorinbox|newsrob|newt|next|ng\-s|ng\/2|nice|nikto|nimb|ninja|ninte|nog|noko|nomad|norb|note|npbot|nuse|nutch|nutex|nwsp|obje|ocel|octo|odi3|oegp|offby|offline|omea|omg|omhttp|onfo|onyx|openf|openssl|openu|opera\ 2|opera\ 3|opera\ 4|opera\ 5|opera\ 6|opera\ 7|orac|orbit|oreg|osis|our|outf|owl|p3p\_|page2rss|pagefet|pansci|parser|patw|pavu|pb2pb|pcbrow|pear|peer|pepe|perfect|perl|petit|phoenix\/0\.|php|phras|picalo|piff|pig|pingd|pipe|pirs|plag|planet|plant|platform|playstation|plesk|pluck|plukkie|poe\-com|poirot|pomp|post|postrank|powerset|preload|press|privoxy|probe|program\_shareware|protect|protocol|prowl|proxie|proxy|psbot|pubsub|puf|pulse|punit|purebot|purity|pyq|pyth|query|quest|qweer|radian|rambler|ramp|rapid|rawdog|rawgrunt|reap|reeder|refresh|reget|relevare|repo|requ|request|rese|retrieve|rip|rix|rma|roboz|rocket|rogue|rpt\-http|rsscache|ruby|ruff|rufus|rv\:0\.9\.7\)|salt|sample|sauger|savvy|sbcyds|sbider|sblog|sbp|scagent|scanner|scej\_|sched|schizo|schlong|schmo|scorp|scott|scout|scrawl|screen|screenshot|script|seamonkey\/1\.5a|search17|searchbot|searchme|sega|semto|sensis|seop|seopro|sept|sezn|seznam|share|sharp|shaz|shell|shelo|sherl|shim|shopwiki|silurian|simple|simplepie|siph|sitekiosk|sitescan|sitevigil|sitex|skam|skimp|sledink|sleip|slide|sly|smag|smurf|snag|snapbot|snapshot|snif|snip|snoop|sock|socsci|sogou|sohu|solr|some|soso|spad|span|spbot|speed|sphere|spin|sproose|spurl|sputnik|spyder|squi|sqwid|sqworm|ssm\_ag|stack|stamp|statbot|state|steel|stilo|strateg|stress|strip|style|subot|such|suck|sume|sunos\ 5\.7|sunrise|superbot|superbro|supervi|surf4me|surfbot|survey|susi|suza|suzu|sweep|sygol|synapse|sync2it|systems|szukacz|tagger|tagoo|tagyu|take|talkro|tamu|tandem|tarantula|tbot|tcf|tcs\/1|teamsoft|tecomi|teesoft|teleport|telesoft|tencent|terrawiz|test|texnut|thomas|tiehttp|timebot|timely|tipp|tiscali|titan|tmcrawler|tmhtload|tocrawl|todobr|tongco|toolbar\;\ \(r1|topic|topyx|torrent|track|translate|traveler|treeview|tricus|trivia|trivial|true|tunnel|turing|turnitin|tutorgig|twat|tweak|twice|tygo|ubee|ultraseek|unavail|unf|universal|unknown|upg1|uptime|urlbase|urllib|urly|user\-agent\:|useragent|usyd|vagabo|valet|vamp|vci|veri\~li|verif|versus|via|virtual|visual|void|voyager|vsyn|w0000t|w3search|walhello|walker|wand|waol|watch|wavefire|wbdbot|weather|web\.ima|web2mal|webarchive|webbot|webcat|webcor|webcorp|webcrawl|webdat|webdup|webgo|webind|webis|webitpr|weblea|webmin|webmoney|webp|webql|webrobot|webster|websurf|webtre|webvac|webzip|wells|wep\_s|wget|whiz|widow|win67|windows\-rss|windows\ 2000|windows\ 3|windows\ 95|windows\ 98|windows\ ce|windows\ me|winht|winodws|wish|wizz|wordp|worio|works|world|worth|wwwc|wwwo|wwwster|xaldon|xbot|xenu|xirq|y\!tunnel|yacy|yahoo\-mmaudvid|yahooseeker|yahooysmcm|yamm|yand|yandex|yang|yoono|yori|yotta|yplus\ |ytunnel|zade|zagre|zeal|zebot|zerx|zeus|zhuaxia|zipcode|zixy|zmao) [NC]
RewriteRule ^.*$ - [G]

View text format

To implement the UA Blacklist, simply paste into your site’s root .htaccess file (or even better, the Apache configuration file). Upload, test, and stay current with updates and news.

Important Note

The UA Blacklist uses hundreds of regular expressions to block bad bots based on their user-agent. Each of these regular expressions can match many different user-agents. Care has been taken to ensure that only bad bots are blocked, but false positives are inevitable. If you know of a user-agent that should be removed from the list, please let me know. I will do my best to update things asap.

Bottom line: Only use this code if you know what you are doing. It’s not a “fix-it-and-forget” situation, especially for production sites. It’s more like a “fix-it-and-keep-an-eye-on-it” kind of thing, meant for those who understand how it works. As mentioned in the comments, the 2010 User-Agent Blacklist is a work in progress. Please use the UA Blacklist with caution and at your own risk.

So much more..

For those new to Perishable Press, please check out some of my other security resources:

Security is an important part of what I do around here, so please chime in with any suggestions, ideas, and comments. Thank you for visiting Perishable Press.

Jeff Starr
About the Author Jeff Starr = Designer. Developer. Producer. Writer. Editor. Etc.
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105 responses
  1. I meant to add that for months I’ve had a persistent user agent that just has this in the user_agent field;

    '

    That’s all, a simple apostrophe.

  2. Jeff Starr

    @Steve:

    1. Yes, please post a comment here or send an email to jeff at this domain. I try to stay current with updates, but sometimes it takes awhile. By keeping everything (issues, ideas, edits) in the thread, it makes updating things a little easier. Whatever works best for you.

    2. I try to do it every week, but sometimes it can take several. Kids are back in school tomorrow, so I should see a dramatic increase of free time =)

    I’ll look into the “apostrophe-only” user-agent for the next update. Thanks.

  3. Ah, this list is quite good. It would be essential for a blog that was under attack before, it covers all of the bad user agents in my list.

    .htaccess files are indeed annoying to implement if they’re not defaults, 500 errors are just the server complaining something is not right.

    You may want to add the following enclosure for the rules though, to stop non-compliant installs to not complain:

    (mod_rewrite code here)

    Good work Jeff, I love the articles greatly!

  4. Whoops, make that:

    <IfModule mod_rewrite.c>
    (htaccess code here)
    </IfModule>

    replacing the obvious

  5. Jeff Starr

    Good call, Alex – Thanks for the reminder :)

  6. Finally, after a while of testing, I found the bot that disallows W3C Markup Validation.

    Search “ida” bot. It’s located between “|icopy|” and “|ie/5.0”.

    So… “|icopy|”…..IDA…..“|ie/5.0”.

    I hope I’ve been helpful !

  7. I’m guessing RSS parsers were added the blacklist to prevent page scraping, but the list shouldn’t blacklist RSS parsers because some sites rely on it as widget blocks.

    I had the blacklist active on a site I was working on and it broke the site because I had SimplePie running on it.

    Just an FYI.

  8. HI John thanks for this amazing resource, just wondering now that i have added the blacklist it has killed 99% of the bot problem i had. i am still getting 2 that are gettig through.

    one of them has a empty user agent and the other is identified by ‘crawl’

    i have added crawl to your blacklist list but how do i stop ones with empty user agent string?

    also is it okay to block ‘crawl’ as well

  9. Hi. Thanks for the code. I would like to use your User Agent Blacklist. I have seen the httpd.conf file but dont understant where to paste it. can you please tell me where to paste in httpd.conf. Please give some clear instructions.

    Thanks.
    James

  10. I think I found another good site for such : http://www.spanishseo.org/block-spam-bots-scrapers

    Hopefully it will be discussed to improve the list here.

  11. Hmm just a question.
    That UA Block List in the form it exists now can be considered error free yet?

    Just asking because I’m far away from calling myself a pro when it comes to those things. I just noticed since a few days I get visits from a bot called: MaMa CaSpEr

    I ask Google for it a few sites later I got told that this seems to be kind of an exploits scanner. Which brings me to your Site esspecially to the Block List here where I noticed Casper is included. So I included your List inside of my htaccess file (what should I say? Now it will be for sure blocked because of the internal Error 500 I get lol)

    I mean my Site went down now, can’t access it anymore because of that internal error which is the reason I ask if that script is error free now?

    Any advice would be highly appricitated…
    Not sure just a guess could it be that maybe I have too much rewrite conditions included inside of my htaccess?

    I’m also not sure about if that bot comes always named as: MaMa CaSpEr
    if so, maybe could you just show me a way to block only this instead of that large list?

    Kindest regards,
    stOrM!

  12. Just a quick heads up. This list does cause issues with wp-super cache. As noted for someone above they had issues with the first half of the list, I had issues with the second half of the list. Once I removed it then the 410 errors went away.

    I’m not savvy enough to know whether this is a bad thing for the cache, but the cache had seemed to be doing it’s job just throwing a 410 error when doing a self test on the cache.

    So Caveat Emptor if you’re a WP Super Cache user and want to use this script.

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