Who blocks AI · #1259 in the Majestic Million

robots.txt · checked 9 Nov 2026

Does ahajournals.org block AI crawlers?

Yes. ahajournals.org’s robots.txt blocks 8 of the 19 AI crawlers we track, including GPTBot, ClaudeBot, Google-Extended and 5 more. Search engines such as Googlebot and Bingbot may crawl it.

GPTBotBlocked OAI-SearchBotAllowed ClaudeBotBlocked PerplexityBotAllowed Google-ExtendedBlocked CCBotBlocked

robots.txt: www.ahajournals.org/robots.txt · 192 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	Blocked	line 177 · `Disallow: /` under `User-agent: YouBot`

AI training

Bot	Operator	robots.txt	Deciding line
`GPTBot`	OpenAI	Blocked	line 37 · `Disallow: /` under `User-agent: GPTBot`
`ClaudeBot`	Anthropic	Blocked	line 53 · `Disallow: /` under `User-agent: ClaudeBot`
`Google-Extended`	Google	Blocked	line 105 · `Disallow: /` under `User-agent: Google-Extended`
`CCBot`	Common Crawl	Blocked	line 81 · `Disallow: /` under `User-agent: CCBot`
`Applebot-Extended`	Apple	Blocked	line 57 · `Disallow: /` under `User-agent: Applebot-Extended`
`GoogleOther`	Google	Allowed	no rule matches the home page
`Meta-ExternalAgent`	Meta	Blocked	line 137 · `Disallow: /` under `User-agent: meta-externalagent`
`Bytespider`	ByteDance	Blocked	line 61 · `Disallow: /` under `User-agent: Bytespider`

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.ahajournals.org/robots.txt · 192 lines

1Sitemap: https://www.ahajournals.org/sitemap-index-1.txt

2User-agent: *

3Disallow: /action

4Disallow: /help

5Disallow: /search

6Disallow: /feedback

7Disallow: /rss

8Disallow: /page/account-confirmation-thanks

9Disallow: /media

10Disallow: /medical-research

11Disallow: /servlet/linkout

12Disallow: /na101/

13Disallow: /na101v1/

14Disallow: /na102/

15Disallow: /doi/mlt/

16Disallow: /topic

17Disallow: /author/

18Disallow: /doi/metrics/

19Disallow: /authored-by/

20Disallow: /history/

21Allow: /action/showJournal

22Allow: /action/showPublications

23Allow: /action/showXml

24Allow: /action/showTopic

25Allow: /action/showBook

26Allow: /action/showCoverImage

27Allow: /action/doSearch

28Crawl-delay: 1

30User-agent: facebookexternalhit

31User-agent: LinkedInBot

32User-agent: Twitterbot

33Allow: /

34Crawl-delay: 1

36User-agent: GPTBot

37Disallow: /

38Crawl-delay: 1

40User-agent: AI2Bot

41Disallow: /

42Crawl-delay: 1

44User-agent: anthropic-ai

45Disallow: /

46Crawl-delay: 1

48User-agent: Claude-Web

49Disallow: /

50Crawl-delay: 1

52User-agent: ClaudeBot

53Disallow: /

54Crawl-delay: 1

56User-agent: Applebot-Extended

57Disallow: /

58Crawl-delay: 1

60User-agent: Bytespider

61Disallow: /

62Crawl-delay: 1

64User-agent: TikTokSpider

65Disallow: /

66Crawl-delay: 1

68User-agent: GPTBot

69Disallow: /

70Crawl-delay: 1

72User-agent: cohere-ai

73Disallow: /

74Crawl-delay: 1

76User-agent: cohere-training-data-crawler

77Disallow: /

78Crawl-delay: 1

80User-agent: CCBot

81Disallow: /

82Crawl-delay: 1

84User-agent: Cotoyogi

85Disallow: /

86Crawl-delay: 1

88User-agent: Ai2Bot-Dolma

89Disallow: /

90Crawl-delay: 1

92User-agent: Factset_spyderbot

93Disallow: /

94Crawl-delay: 1

96User-agent: FirecrawlAgent

97Disallow: /

98Crawl-delay: 1

100User-agent: FriendlyCrawler

101Disallow: /

102Crawl-delay: 1

103

104User-agent: Google-Extended

105Disallow: /

106Crawl-delay: 1

107

108User-agent: PanguBot

109Disallow: /

110Crawl-delay: 1

111

112User-agent: ICC-Crawler

113Disallow: /

114Crawl-delay: 1

115

116User-agent: img2dataset

117Disallow: /

118Crawl-delay: 1

119

120User-agent: imgproxy

121Disallow: /

122Crawl-delay: 1

123

124User-agent: ISSCyberRiskCrawler

125Disallow: /

126Crawl-delay: 1

127

128User-agent: Kangaroo Bot

129Disallow: /

130Crawl-delay: 1

131

132User-agent: FacebookBot

133Disallow: /

134Crawl-delay: 1

135

136User-agent: meta-externalagent

137Disallow: /

138Crawl-delay: 1

139

140User-agent: Crawlspace

141Disallow: /

142Crawl-delay: 1

143

144User-agent: Scrapy

145Disallow: /

146Crawl-delay: 1

147

148User-agent: SemrushBot-OCOB

149Disallow: /

150Crawl-delay: 1

151

152User-agent: SemrushBot-SWA

153Disallow: /

154Crawl-delay: 1

155

156User-agent: Sidetrade indexer bot

157Disallow: /

158Crawl-delay: 1

159

160User-agent: VelenPublicWebCrawler

161Disallow: /

162Crawl-delay: 1

163

164User-agent: omgili

165Disallow: /

166Crawl-delay: 1

167

168User-agent: omgilibot

169Disallow: /

170Crawl-delay: 1

171

172User-agent: Webzio-Extended

173Disallow: /

174Crawl-delay: 1

175

176User-agent: YouBot

177Disallow: /

178Crawl-delay: 1

179

180User-agent: aiHitBot

181Disallow: /

182Crawl-delay: 1

183

184User-agent: Brightbot 1.0

185Disallow: /

186Crawl-delay: 1

187

188User-agent: ImagesiftBot

189Disallow: /

190Crawl-delay: 1

191

192

What do the bots actually get?

This page reads robots.txt, which states what ahajournals.org 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 ahajournals.org Test a path in the robots.txt tester

History

19 October 2026: first checked.

Questions

Does ahajournals.org block GPTBot?

Yes. ahajournals.org’s robots.txt disallows GPTBot from the whole site (line 37: Disallow: /). GPTBot is OpenAI’s crawler for training data; blocking it doesn’t affect ChatGPT search, which uses OAI-SearchBot. Checked 9 November 2026.

Does ahajournals.org block ClaudeBot?

Yes. ahajournals.org’s robots.txt disallows ClaudeBot from the whole site (line 53: Disallow: /). ClaudeBot is Anthropic’s crawler for training data. Checked 9 November 2026.

Does ahajournals.org block Google-Extended?

Yes. ahajournals.org’s robots.txt disallows Google-Extended from the whole site (line 105: Disallow: /). 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 ahajournals.org block PerplexityBot?

No. ahajournals.org’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 ahajournals.org?

Yes. ahajournals.org’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.