Block Unwanted Bots on Apache & Nginx

Robots.txt version

Code:

User-agent: AhrefsBot
User-agent: AhrefsSiteAudit
User-agent: adbeat_bot
User-agent: Alexibot
User-agent: AppEngine
User-agent: Aqua_Products
User-agent: archive.org_bot
User-agent: archive
User-agent: asterias
User-agent: b2w/0.1
User-agent: BackDoorBot/1.0
User-agent: BecomeBot
User-agent: BlekkoBot
User-agent: Blexbot
User-agent: BlowFish/1.0
User-agent: Bookmark search tool
User-agent: BotALot
User-agent: BuiltBotTough
User-agent: Bullseye/1.0
User-agent: BunnySlippers
User-agent: CCBot
User-agent: CheeseBot
User-agent: CherryPicker
User-agent: CherryPickerElite/1.0
User-agent: CherryPickerSE/1.0
User-agent: chroot
User-agent: Copernic
User-agent: CopyRightCheck
User-agent: cosmos
User-agent: Crescent
User-agent: Crescent Internet ToolPak HTTP OLE Control v.1.0
User-agent: DittoSpyder
User-agent: dotbot
User-agent: dumbot
User-agent: EmailCollector
User-agent: EmailSiphon
User-agent: EmailWolf
User-agent: Enterprise_Search
User-agent: Enterprise_Search/1.0
User-agent: EroCrawler
User-agent: es
User-agent: exabot
User-agent: ExtractorPro
User-agent: FairAd Client
User-agent: Flaming AttackBot
User-agent: Foobot
User-agent: Gaisbot
User-agent: GetRight/4.2
User-agent: gigabot
User-agent: grub
User-agent: grub-client
User-agent: Go-http-client
User-agent: Harvest/1.5
User-agent: Hatena Antenna
User-agent: hloader
User-agent: http://www.SearchEngineWorld.com bot
User-agent: http://www.WebmasterWorld.com bot
User-agent: httplib
User-agent: humanlinks
User-agent: ia_archiver
User-agent: ia_archiver/1.6
User-agent: InfoNaviRobot
User-agent: Iron33/1.0.2
User-agent: JamesBOT
User-agent: JennyBot
User-agent: Jetbot
User-agent: Jetbot/1.0
User-agent: Jorgee
User-agent: Kenjin Spider
User-agent: Keyword Density/0.9
User-agent: larbin
User-agent: LexiBot
User-agent: libWeb/clsHTTP
User-agent: LinkextractorPro
User-agent: LinkpadBot
User-agent: LinkScan/8.1a Unix
User-agent: LinkWalker
User-agent: LNSpiderguy
User-agent: looksmart
User-agent: lwp-trivial
User-agent: lwp-trivial/1.34
User-agent: Mata Hari
User-agent: Megalodon
User-agent: Microsoft URL Control
User-agent: Microsoft URL Control - 5.01.4511
User-agent: Microsoft URL Control - 6.00.8169
User-agent: MIIxpc
User-agent: MIIxpc/4.2
User-agent: Mister PiX
User-agent: MJ12bot
User-agent: moget
User-agent: moget/2.1
User-agent: mozilla
User-agent: Mozilla
User-agent: mozilla/3
User-agent: mozilla/4
User-agent: Mozilla/4.0 (compatible; BullsEye; Windows 95)
User-agent: Mozilla/4.0 (compatible; MSIE 4.0; Windows 2000)
User-agent: Mozilla/4.0 (compatible; MSIE 4.0; Windows 95)
User-agent: Mozilla/4.0 (compatible; MSIE 4.0; Windows 98)
User-agent: Mozilla/4.0 (compatible; MSIE 4.0; Windows NT)
User-agent: Mozilla/4.0 (compatible; MSIE 4.0; Windows XP)
User-agent: mozilla/5
User-agent: MSIECrawler
User-agent: naver
User-agent: NerdyBot
User-agent: NetAnts
User-agent: NetMechanic
User-agent: NICErsPRO
User-agent: Nutch
User-agent: Offline Explorer
User-agent: Openbot
User-agent: Openfind
User-agent: Openfind data gathere
User-agent: Oracle Ultra Search
User-agent: PerMan
User-agent: ProPowerBot/2.14
User-agent: ProWebWalker
User-agent: psbot
User-agent: Python-urllib
User-agent: QueryN Metasearch
User-agent: Radiation Retriever 1.1
User-agent: RepoMonkey
User-agent: RepoMonkey Bait & Tackle/v1.01
User-agent: RMA
User-agent: rogerbot
User-agent: scooter
User-agent: Screaming Frog SEO Spider
User-agent: searchpreview
User-agent: SEMrushBot
User-agent: SemrushBot
User-agent: SemrushBot-SA
User-agent: SEOkicks-Robot
User-agent: SiteSnagger
User-agent: sootle
User-agent: SpankBot
User-agent: spanner
User-agent: spbot
User-agent: Stanford
User-agent: Stanford Comp Sci
User-agent: Stanford CompClub
User-agent: Stanford CompSciClub
User-agent: Stanford Spiderboys
User-agent: SurveyBot
User-agent: SurveyBot_IgnoreIP
User-agent: suzuran
User-agent: Szukacz/1.4
User-agent: Szukacz/1.4
User-agent: Teleport
User-agent: TeleportPro
User-agent: Telesoft
User-agent: Teoma
User-agent: The Intraformant
User-agent: TheNomad
User-agent: toCrawl/UrlDispatcher
User-agent: True_Robot
User-agent: True_Robot/1.0
User-agent: turingos
User-agent: Typhoeus
User-agent: URL Control
User-agent: URL_Spider_Pro
User-agent: URLy Warning
User-agent: VCI
User-agent: VCI WebViewer VCI WebViewer Win32
User-agent: Web Image Collector
User-agent: WebAuto
User-agent: WebBandit
User-agent: WebBandit/3.50
User-agent: WebCopier
User-agent: WebEnhancer
User-agent: WebmasterWorld Extractor
User-agent: WebmasterWorldForumBot
User-agent: WebSauger
User-agent: Website Quester
User-agent: Webster Pro
User-agent: WebStripper
User-agent: WebVac
User-agent: WebZip
User-agent: WebZip/4.0
User-agent: Wget
User-agent: Wget/1.5.3
User-agent: Wget/1.6
User-agent: WWW-Collector-E
User-agent: Xenu's
User-agent: Xenu's Link Sleuth 1.1c
User-agent: Zeus
User-agent: Zeus 32297 Webster Pro V2.9 Win32
User-agent: Zeus Link Scout
Disallow: /    

.htaccess version (Apache)

Code:

RewriteEngine On
RewriteCond %{REQUEST_URI} !/robots.txt$
RewriteCond %{HTTP_USER_AGENT} ^$ [OR]
RewriteCond %{HTTP_USER_AGENT} ^.*EventMachine.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*NerdyBot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Typhoeus.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*archive.org_bot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*archive.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*adbeat_bot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*github.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*chroot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Jorgee.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Go\ 1.1\ package.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Go-http-client.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Copyscape.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*semrushbot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*semrushbot-sa.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*JamesBOT.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*SEOkicks-Robot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*LinkpadBot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*getty.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*picscout.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*AppEngine.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Zend_Http_Client.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*BlackWidow.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*openlink.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*spbot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Nutch.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Jetbot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebVac.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Stanford.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*scooter.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*naver.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*dumbot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Hatena\ Antenna.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*grub.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*looksmart.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebZip.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*larbin.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*b2w/0.1.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Copernic.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*psbot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Python-urllib.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*NetMechanic.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*URL_Spider_Pro.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*CherryPicker.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*ExtractorPro.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*CopyRightCheck.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Crescent.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*CCBot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*SiteSnagger.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*ProWebWalker.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*CheeseBot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*LNSpiderguy.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*EmailCollector.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*EmailSiphon.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebBandit.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*EmailWolf.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*ia_archiver.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Alexibot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Teleport.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*MIIxpc.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Telesoft.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Website\ Quester.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*moget.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebStripper.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebSauger.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebCopier.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*NetAnts.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Mister\ PiX.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebAuto.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*TheNomad.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WWW-Collector-E.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*RMA.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*libWeb/clsHTTP.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*asterias.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*httplib.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*turingos.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*spanner.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Harvest.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*InfoNaviRobot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Bullseye.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebBandit.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*NICErsPRO.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Microsoft\ URL\ Control.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*DittoSpyder.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Foobot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebmasterWorldForumBot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*SpankBot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*BotALot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*lwp-trivial.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebmasterWorld.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*BunnySlippers.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*URLy\ Warning.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*LinkWalker.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*cosmos.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*hloader.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*humanlinks.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*LinkextractorPro.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Offline\ Explorer.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Mata\ Hari.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*LexiBot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Web\ Image\ Collector.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*woobot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*The\ Intraformant.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*True_Robot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*BlowFish.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*SearchEngineWorld.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*JennyBot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*MIIxpc.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*BuiltBotTough.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*ProPowerBot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*BackDoorBot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*toCrawl/UrlDispatcher.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebEnhancer.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*suzuran.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebViewer.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*VCI.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Szukacz.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*QueryN.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Openfind.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Openbot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Webster.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*EroCrawler.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*LinkScan.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Keyword.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Kenjin.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Iron33.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Bookmark\ search\ tool.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*GetRight.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*FairAd\ Client.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Gaisbot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Aqua_Products.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Radiation\ Retriever\ 1.1.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Flaming\ AttackBot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Oracle\ Ultra\ Search.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*MSIECrawler.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*PerMan.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*searchpreview.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*sootle.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Enterprise_Search.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Bot\ mailto:craftbot@yahoo.com.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*ChinaClaw.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Custo.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*DISCo.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Download\ Demon.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*eCatch.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*EirGrabber.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*EmailSiphon.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*EmailWolf.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Express\ WebPictures.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*ExtractorPro.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*EyeNetIE.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*FlashGet.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*GetRight.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*GetWeb!.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Go!Zilla.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Go-Ahead-Got-It.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*GrabNet.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Grafula.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*HMView.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*HTTrack.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Image\ Stripper.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Image\ Sucker.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Indy\ Library.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*InterGET.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Internet\ Ninja.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*JetCar.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*JOC\ Web\ Spider.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*larbin.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*LeechFTP.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Mass\ Downloader.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*MIDown\ tool.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Mister\ PiX.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Navroad.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*NearSite.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*NetAnts.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*NetSpider.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Net\ Vampire.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*NetZIP.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Octopus.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Offline\ Explorer.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Offline\ Navigator.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*PageGrabber.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Papa\ Foto.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*pavuk.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*pcBrowser.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*RealDownload.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*ReGet.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*SiteSnagger.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*SmartDownload.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*SuperBot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*SuperHTTP.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Surfbot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*tAkeOut.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Teleport\ Pro.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*VoidEYE.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Web\ Image\ Collector.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Web\ Sucker.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebAuto.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebCopier.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebFetch.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebGo\ IS.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebLeacher.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebReaper.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebSauger.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*wesee.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Website\ eXtractor.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Website\ Quester.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebStripper.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebWhacker.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebZIP.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Wget.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Widow.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WWWOFFLE.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Xaldon\ WebSpider.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Zeus.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Semrush.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*BecomeBot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Screaming.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Screaming\ FrogSEO.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*SEO.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*AhrefsBot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*AhrefsSiteAudit.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*MJ12bot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*rogerbot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*exabot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Xenu.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*dotbot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*gigabot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Twengabot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*htmlparser.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*libwww.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Python.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*perl.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*urllib.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*scan.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Curl.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*email.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*PycURL.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*Pyth.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*PyQ.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebCollector.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*WebCopy.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*webcraw.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*webcraw.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*SurveyBot.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*SurveyBot_IgnoreIP.*$ [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ^.*BlekkoBot.*$ [NC]
RewriteRule ^.*.* http://www.google.com/ [L]

nginx.conf version (NGINX)

inside http block (nginx.conf)

Code:

http {
map $http_user_agent $limit_bots {
     default 0;
     ~*(adbeat_bot|ahrefsbot|ahrefssiteaudit|alexibot|appengine|aqua_products|archive.org_bot|archive|asterias|attackbot|b2w|backdoorbot|becomebot|blackwidow|blekkobot) 1;
     ~*(blowfish|botalot|builtbottough|bullseye|bunnyslippers|ccbot|cheesebot|cherrypicker|chinaclaw|chroot|clshttp|collector) 1;
     ~*(control|copernic|copyrightcheck|copyscape|cosmos|craftbot|crescent|curl|custo|demon) 1;
     ~*(disco|dittospyder|dotbot|download|downloader|dumbot|ecatch|eirgrabber|email|emailcollector) 1;
     ~*(emailsiphon|emailwolf|enterprise_search|erocrawler|eventmachine|exabot|express|extractor|extractorpro|eyenetie) 1;
     ~*(fairad|flaming|flashget|foobot|foto|gaisbot|getright|getty|getweb!|gigabot) 1;
     ~*(github|go!zilla|go-ahead-got-it|go-http-client|grabnet|grafula|grub|hari|harvest|hatena|antenna|hloader) 1;
     ~*(hmview|htmlparser|httplib|httrack|humanlinks|ia_archiver|indy|infonavirobot|interget|intraformant) 1;
     ~*(iron33|jamesbot|jennybot|jetbot|jetcar|joc|jorgee|kenjin|keyword|larbin|leechftp) 1;
     ~*(lexibot|library|libweb|libwww|linkextractorpro|linkpadbot|linkscan|linkwalker|lnspiderguy|looksmart) 1;
     ~*(lwp-trivial|mass|mata|midown|miixpc|mister|mj12bot|moget|msiecrawler|naver) 1;
     ~*(navroad|nearsite|nerdybot|netants|netmechanic|netspider|netzip|nicerspro|ninja|nutch) 1;
     ~*(octopus|offline|openbot|openfind|openlink|pagegrabber|papa|pavuk|pcbrowser|perl) 1;
     ~*(perman|picscout|propowerbot|prowebwalker|psbot|pycurl|pyq|pyth|python) 1;
     ~*(python-urllib|queryn|quester|radiation|realdownload|reget|retriever|rma|rogerbot|scan|screaming|frog|seo) 1;
     ~*(scooter|searchengineworld|searchpreview|semrush|semrushbot|semrushbot-sa|seokicks-robot|sitesnagger|smartdownload|sootle) 1;
     ~*(spankbot|spanner|spbot|spider|stanford|stripper|sucker|superbot|superhttp|surfbot|surveybot) 1;
     ~*(suzuran|szukacz|takeout|teleport|telesoft|thenomad|tocrawl|tool|true_robot|turingos) 1;
     ~*(twengabot|typhoeus|url_spider_pro|urldispatcher|urllib|urly|vampire|vci|voideye|warning) 1;
     ~*(webauto|webbandit|webcollector|webcopier|webcopy|webcraw|webenhancer|webfetch|webgo|webleacher) 1;
     ~*(webmasterworld|webmasterworldforumbot|webpictures|webreaper|websauger|webspider|webster|webstripper|webvac|webviewer) 1;
     ~*(webwhacker|webzip|webzip|wesee|wget|widow|woobot|www-collector-e|wwwoffle|xenu) 1;
}
}

inside each server block (within your example.com file inside sites-available folder)

Code:

server {
location / {
#blocks blank user_agents
if ($http_user_agent = "") { return  301 $scheme://www.google.com/; }

  if ($limit_bots = 1) {
  return  301 $scheme://www.google.com/;
  }
}
}