Who blocks AI · #441 in the Majestic Million

robots.txt · checked 9 Nov 2026

Does jamanetwork.com block AI crawlers?

Yes. jamanetwork.com’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: jamanetwork.com/robots.txt · 135 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 110 · `Disallow: /` under `User-agent: YouBot`

AI training

Bot	Operator	robots.txt	Deciding line
`GPTBot`	OpenAI	Blocked	line 56 · `Disallow: /` under `User-agent: GPTBot`
`ClaudeBot`	Anthropic	Blocked	line 48 · `Disallow: /` under `User-agent: ClaudeBot`
`Google-Extended`	Google	Blocked	line 74 · `Disallow: /` under `User-agent: Google-Extended`
`CCBot`	Common Crawl	Blocked	line 62 · `Disallow: /` under `User-agent: CCBot`
`Applebot-Extended`	Apple	Blocked	line 50 · `Disallow: /` under `User-agent: Applebot-Extended`
`GoogleOther`	Google	Allowed	no rule matches the home page
`Meta-ExternalAgent`	Meta	Blocked	line 90 · `Disallow: /` under `User-agent: meta-externalagent`
`Bytespider`	ByteDance	Blocked	line 52 · `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 jamanetwork.com/robots.txt · 135 lines

2User-agent: 008

3Disallow: /

5User-agent: *

6Disallow: /bin/

7Disallow: /config/

8Disallow: /app_data/

9Disallow: /dlls/

10Disallow: /App_Themes/

11Disallow: /DownloadFile/

12Disallow: /Citation/

13Disallow: /Shibboleth.sso/

14Disallow: /SignInShibboleth.aspx

15Disallow: /lookup/external-ref

16Disallow: /user/logout

17Disallow: /cgi/pmidlookup

18Disallow: /lookup/google-scholar

19Disallow: /store/*

20Disallow: /*.axd

21Disallow: /DocumentViewer/*

22Disallow: /sign-in?*

23Disallow: /my-account/

24Disallow: /institutional-login

25Disallow: /Personalization/

26Disallow: /crawlprevention/

27Disallow: /view-large/

28Disallow: /*/crossref-citedby

29Disallow: /*/CrossRef-CitedBy

30Disallow: /api/

31Disallow: /UserControls/

32Disallow: /MasterPages/

33Disallow: /cgi-bin/

34Disallow: /6479/

35Disallow: /downloadcitation/

36Disallow: /signinshibboleth

37Disallow: /myaccount

38Disallow: /documents/

39Disallow: /text-and-data-mining

41User-agent: AI2Bot

42Disallow: /

43User-agent: anthropic-ai

44Disallow: /

45User-agent: Claude-Web

46Disallow: /

47User-agent: ClaudeBot

48Disallow: /

49User-agent: Applebot-Extended

50Disallow: /

51User-agent: Bytespider

52Disallow: /

53User-agent: TikTokSpider

54Disallow: /

55User-agent: GPTBot

56Disallow: /

57User-agent: cohere-ai

58Disallow: /

59User-agent: cohere-training-data-crawler

60Disallow: /

61User-agent: CCBot

62Disallow: /

63User-agent: Cotoyogi

64Disallow: /

65User-agent: Ai2Bot-Dolma

66Disallow: /

67User-agent: Factset_spyderbot

68Disallow: /

69User-agent: FirecrawlAgent

70Disallow: /

71User-agent: FriendlyCrawler

72Disallow: /

73User-agent: Google-Extended

74Disallow: /

75User-agent: PanguBot

76Disallow: /

77User-agent: ICC-Crawler

78Disallow: /

79User-agent: img2dataset

80Disallow: /

81User-agent: imgproxy

82Disallow: /

83User-agent: ISSCyberRiskCrawler

84Disallow: /

85User-agent: Kangaroo Bot

86Disallow: /

87User-agent: FacebookBot

88Disallow: /

89User-agent: meta-externalagent

90Disallow: /

91User-agent: Crawlspace

92Disallow: /

93User-agent: Scrapy

94Disallow: /

95User-agent: SemrushBot-OCOB

96Disallow: /

97User-agent: SemrushBot-SWA

98Disallow: /

99User-agent: Sidetrade indexer bot

100Disallow: /

101User-agent: VelenPublicWebCrawler

102Disallow: /

103User-agent: omgili

104Disallow: /

105User-agent: omgilibot

106Disallow: /

107User-agent: Webzio-Extended

108Disallow: /

109User-agent: YouBot

110Disallow: /

111User-agent: aiHitBot

112Disallow: /

113User-agent: Brightbot 1.0

114Disallow: /

115User-agent: ImagesiftBot

116Disallow: /

117

118Sitemap: https://jamanetwork.com/data/sitemap/Site_11/sitemap_11.xml

119Sitemap: https://jamanetwork.com/data/sitemap/Site_3/sitemap_J67.xml

120Sitemap: https://jamanetwork.com/data/sitemap/Site_12/sitemap_J68.xml

121Sitemap: https://jamanetwork.com/data/sitemap/Site_13/sitemap_J69.xml

122Sitemap: https://jamanetwork.com/data/sitemap/Site_14/sitemap_J70.xml

123Sitemap: https://jamanetwork.com/data/sitemap/Site_15/sitemap_J71.xml

124Sitemap: https://jamanetwork.com/data/sitemap/Site_16/sitemap_J72.xml

125Sitemap: https://jamanetwork.com/data/sitemap/Site_17/sitemap_J73.xml

126Sitemap: https://jamanetwork.com/data/sitemap/Site_18/sitemap_J74.xml

127Sitemap: https://jamanetwork.com/data/sitemap/Site_19/sitemap_J75.xml

128Sitemap: https://jamanetwork.com/data/sitemap/Site_20/sitemap_J76.xml

129Sitemap: https://jamanetwork.com/data/sitemap/Site_23/sitemap_J91.xml

130Sitemap: https://jamanetwork.com/data/sitemap/Site_159/sitemap_J174.xml

131Sitemap: https://jamanetwork.com/data/sitemap/Site_192/sitemap_J184.xml

132Sitemap: https://jamanetwork.com/data/sitemap/Site_193/sitemap_J185.xml

133Sitemap: https://jamanetwork.com/data/sitemap/Site_214/sitemap_J187.xml

134Sitemap: https://jamanetwork.com/data/sitemap/Site_261/sitemap_J206.xml

135

What do the bots actually get?

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

History

19 October 2026: first checked.

Questions

Does jamanetwork.com block GPTBot?

Yes. jamanetwork.com’s robots.txt disallows GPTBot from the whole site (line 56: 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 jamanetwork.com block ClaudeBot?

Yes. jamanetwork.com’s robots.txt disallows ClaudeBot from the whole site (line 48: Disallow: /). ClaudeBot is Anthropic’s crawler for training data. Checked 9 November 2026.

Does jamanetwork.com block Google-Extended?

Yes. jamanetwork.com’s robots.txt disallows Google-Extended from the whole site (line 74: 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 jamanetwork.com block PerplexityBot?

No. jamanetwork.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 jamanetwork.com?

Yes. jamanetwork.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.