Who blocks AI · #612 in the Majestic Million

robots.txt · checked 9 Nov 2026

Does zend.com block AI crawlers?

No. zend.com’s robots.txt lets all 19 AI crawlers we track crawl the site. Search engines such as Googlebot and Bingbot may crawl it.

GPTBotAllowed OAI-SearchBotAllowed ClaudeBotAllowed PerplexityBotAllowed Google-ExtendedAllowed CCBotAllowed

robots.txt: www.zend.com/robots.txt · 139 lines
llms.txt: none
Checked: 9 November 2026, as canaicrawl. We check again every week.

Every bot, and the line that decides

Search engines

Bot	Operator	robots.txt	Deciding line
`Googlebot`	Google	Allowed	no rule matches the home page
`Bingbot`	Microsoft	Allowed	no rule matches the home page
`DuckDuckBot`	DuckDuckGo	Allowed	no rule matches the home page
`Applebot`	Apple	Allowed	no rule matches the home page
`PetalBot`	Huawei	Allowed	no rule matches the home page
`YandexBot`	Yandex	Allowed	no rule matches the home page
`Baiduspider`	Baidu	Allowed	no rule matches the home page

AI search

Bot	Operator	robots.txt	Deciding line
`OAI-SearchBot`	OpenAI	Allowed	no rule matches the home page
`PerplexityBot`	Perplexity	Allowed	no rule matches the home page
`Claude-SearchBot`	Anthropic	Allowed	no rule matches the home page
`DuckAssistBot`	DuckDuckGo	Allowed	no rule matches the home page
`Amazonbot`	Amazon	Allowed	no rule matches the home page
`YouBot`	You.com	Allowed	no rule matches the home page

AI training

Bot	Operator	robots.txt	Deciding line
`GPTBot`	OpenAI	Allowed	no rule matches the home page
`ClaudeBot`	Anthropic	Allowed	no rule matches the home page
`Google-Extended`	Google	Allowed	no rule matches the home page
`CCBot`	Common Crawl	Allowed	no rule matches the home page
`Applebot-Extended`	Apple	Allowed	no rule matches the home page
`GoogleOther`	Google	Allowed	no rule matches the home page
`Meta-ExternalAgent`	Meta	Allowed	no rule matches the home page
`Bytespider`	ByteDance	Allowed	no rule matches the home page

User-triggered fetchers

Bot	Operator	robots.txt	Deciding line
`ChatGPT-User`	OpenAI	Allowed	no rule matches the home page
`Claude-User`	Anthropic	Allowed	no rule matches the home page
`Perplexity-User`	Perplexity	Allowed	no rule matches the home page
`MistralAI-User`	Mistral	Allowed	no rule matches the home page
`Meta-ExternalFetcher`	Meta	Allowed	no rule matches the home page

SEO tools

Bot	Operator	robots.txt	Deciding line
`AhrefsBot`	Ahrefs	Allowed	no rule matches the home page
`SemrushBot`	Semrush	Allowed	no rule matches the home page
`MJ12bot`	Majestic	Allowed	no rule matches the home page
`DotBot`	Moz	Allowed	no rule matches the home page

View www.zend.com/robots.txt · 139 lines

1User-agent: *

2Disallow: /events/longhorn-php-promo

3# SLA

4Disallow: /sites/zend/files/pdfs/comparison-chart-zend-production-support-sla.pdf

6Sitemap: https://www.zend.com/index/sitemap.xml

9# robots.txt

10#

11# This file is to prevent the crawling and indexing of certain parts

12# of your site by web crawlers and spiders run by sites like Yahoo!

13# and Google. By telling these "robots" where not to go on your site,

14# you save bandwidth and server resources.

15#

16# This file will be ignored unless it is at the root of your host:

17# Used: http://example.com/robots.txt

18# Ignored: http://example.com/site/robots.txt

19#

20# For more information about the robots.txt standard, see:

21# http://www.robotstxt.org/robotstxt.html

23User-agent: *

24# CSS, JS, Images

25Allow: /core/*.css$

26Allow: /core/*.css?

27Allow: /core/*.js$

28Allow: /core/*.js?

29Allow: /core/*.avif

30Allow: /core/*.gif

31Allow: /core/*.jpg

32Allow: /core/*.jpeg

33Allow: /core/*.png

34Allow: /core/*.svg

35Allow: /core/*.webp

36Allow: /profiles/*.css$

37Allow: /profiles/*.css?

38Allow: /profiles/*.js$

39Allow: /profiles/*.js?

40Allow: /profiles/*.avif

41Allow: /profiles/*.gif

42Allow: /profiles/*.jpg

43Allow: /profiles/*.jpeg

44Allow: /profiles/*.png

45Allow: /profiles/*.svg

46Allow: /profiles/*.webp

47# Directories

48Disallow: /core/

49Disallow: /profiles/

50# Files

51Disallow: /README.md

52Disallow: /composer/Metapackage/README.txt

53Disallow: /composer/Plugin/ProjectMessage/README.md

54Disallow: /composer/Plugin/Scaffold/README.md

55Disallow: /composer/Plugin/VendorHardening/README.txt

56Disallow: /composer/Template/README.txt

57Disallow: /modules/README.txt

58Disallow: /sites/README.txt

59Disallow: /themes/README.txt

60# Paths (clean URLs)

61Disallow: /admin/

62Disallow: /comment/reply/

63Disallow: /filter/tips

64Disallow: /node/add/

65Disallow: /search/

66Disallow: /search?

67Disallow: /user/register

68Disallow: /user/password

69Disallow: /user/login

70Disallow: /user/logout

71Disallow: /media/oembed

72Disallow: /*/media/oembed

73# Paths (no clean URLs)

74Disallow: /index.php/admin/

75Disallow: /index.php/comment/reply/

76Disallow: /index.php/filter/tips

77Disallow: /index.php/node/add/

78Disallow: /index.php/search/

79Disallow: /index.php/search?

80Disallow: /index.php/user/password

81Disallow: /index.php/user/register

82Disallow: /index.php/user/login

83Disallow: /index.php/user/logout

84Disallow: /index.php/media/oembed

85Disallow: /index.php/*/media/oembed

87# Disallow Specific Query String Parameters

88Disallow: /*&utm_source*

89Disallow: /*&utm_medium*

90Disallow: /*&utm_campaign*

91Disallow: /*&utm_content*

92Disallow: /*&utm_leadersource*

93Disallow: /*&field=*

94Disallow: /*?utm_source*

95Disallow: /*?utm_medium*

96Disallow: /*?utm_campaign*

97Disallow: /*?utm_content*

98Disallow: /*?utm_leadersource*

99Disallow: /*?field=*

100Disallow: /*?field_*

101Disallow: /*?replytocom=*

102Disallow: /*?hsFormKey=*

103Disallow: /*?wvideo=*

104Disallow: /*?wtime=*

105Disallow: /*?goback=*

106Disallow: /*??*

107Disallow: /*?gni=*

108Disallow: /*?fromStream=*

109Disallow: /*?gnk=*

110Disallow: /*?hsCtaTracking=*

111Disallow: /*?(RoW2)=*

112Disallow: /*?mkt_tok=*

113Disallow: /*?r=*

114Disallow: /*?__hstc=*

115Disallow: /*?trk=*

116Disallow: /*?nonamp=*

117Disallow: /*?NA=*

118Disallow: /*?(NA)=*

119Disallow: /*?ref=*

120Disallow: /*?hss_channel=*

121Disallow: /*?PRID=*

122Disallow: /*?sc=*

123Disallow: /*?paper=*

124Disallow: /*?platform=*

125Disallow: /*?path=*

126Disallow: /*?Gen-MD=*

127Disallow: /*?source=*

128Disallow: /*?v=*

129Disallow: /*?en-=*

130Disallow: /*?mgs1=*

131Disallow: /*?examples=*

132Disallow: /*?turl=*

133Disallow: /*?EntryId=*

134Disallow: /search/results?*

135Disallow: /success/*

136Disallow: /user/*

137

138# Marketo Forms

139Disallow: /marketo/form/perforce_marketo_form/*

What do the bots actually get?

This page reads robots.txt, which states what zend.com asks of crawlers. A firewall or CDN can still refuse a bot that robots.txt allows. The live check requests the page as each bot and shows the status it gets.

Run a live check on zend.com Test a path in the robots.txt tester

History

19 October 2026: first checked.

Questions

Does zend.com block GPTBot?

No. zend.com’s robots.txt lets GPTBot crawl the site. GPTBot is OpenAI’s crawler for training data; blocking it doesn’t affect ChatGPT search, which uses OAI-SearchBot. Checked 9 November 2026.

Does zend.com block ClaudeBot?

No. zend.com’s robots.txt lets ClaudeBot crawl the site. ClaudeBot is Anthropic’s crawler for training data. Checked 9 November 2026.

Does zend.com block Google-Extended?

No. zend.com’s robots.txt lets Google-Extended crawl the site. Google-Extended is the token that controls whether Google may use pages for Gemini training and grounding; it doesn’t affect Google Search. Checked 9 November 2026.

Does zend.com block PerplexityBot?

No. zend.com’s robots.txt lets PerplexityBot crawl the site. PerplexityBot is the crawler that indexes pages for Perplexity’s answers. Checked 9 November 2026.

Can ChatGPT search find zend.com?

Yes. zend.com’s robots.txt lets OAI-SearchBot crawl the site. OAI-SearchBot is the crawler behind ChatGPT search; blocking it keeps the site out of ChatGPT’s search answers. Checked 9 November 2026.