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Who blocks AI · #1014 in the Majestic Million

robots.txt · checked 9 Nov 2026

Does rsc.org block AI crawlers?

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

GPTBotAllowedOAI-SearchBotAllowedClaudeBotAllowedPerplexityBotAllowedGoogle-ExtendedAllowedCCBotAllowed
robots.txt
www.rsc.org/robots.txt · 92 lines
llms.txt
none
Checked
9 November 2026, as canaicrawl. We check again every week.

Every bot, and the line that decides

Search engines

BotOperatorrobots.txtDeciding line
GooglebotGoogleAllowedno rule matches the home page
BingbotMicrosoftAllowedno rule matches the home page
DuckDuckBotDuckDuckGoAllowedno rule matches the home page
ApplebotAppleAllowedno rule matches the home page
PetalBotHuaweiAllowedno rule matches the home page
YandexBotYandexAllowedno rule matches the home page
BaiduspiderBaiduAllowedno rule matches the home page

AI search

BotOperatorrobots.txtDeciding line
OAI-SearchBotOpenAIAllowedno rule matches the home page
PerplexityBotPerplexityAllowedno rule matches the home page
Claude-SearchBotAnthropicAllowedno rule matches the home page
DuckAssistBotDuckDuckGoAllowedno rule matches the home page
AmazonbotAmazonAllowedno rule matches the home page
YouBotYou.comAllowedno rule matches the home page

AI training

BotOperatorrobots.txtDeciding line
GPTBotOpenAIAllowedno rule matches the home page
ClaudeBotAnthropicAllowedno rule matches the home page
Google-ExtendedGoogleAllowedno rule matches the home page
CCBotCommon CrawlAllowedno rule matches the home page
Applebot-ExtendedAppleAllowedno rule matches the home page
GoogleOtherGoogleAllowedno rule matches the home page
Meta-ExternalAgentMetaAllowedno rule matches the home page
BytespiderByteDanceAllowedno rule matches the home page

User-triggered fetchers

BotOperatorrobots.txtDeciding line
ChatGPT-UserOpenAIAllowedno rule matches the home page
Claude-UserAnthropicAllowedno rule matches the home page
Perplexity-UserPerplexityAllowedno rule matches the home page
MistralAI-UserMistralAllowedno rule matches the home page
Meta-ExternalFetcherMetaAllowedno rule matches the home page

SEO tools

BotOperatorrobots.txtDeciding line
AhrefsBotAhrefsBlockedline 87 · Disallow: / under User-agent: AhrefsBot
SemrushBotSemrushAllowedno rule matches the home page
MJ12botMajesticAllowedno rule matches the home page
DotBotMozAllowedno rule matches the home page
View www.rsc.org/robots.txt · 92 lines
1##ACAP version=1.0
2
3# allow contracted search
4User-agent: gsa-crawler
5Disallow:
6
7# block GuideBot
8User-agent: Guidebot
9Disallow: /
10
11# block robots
12User-agent: *
13Disallow: /Membership/Memberzone/
14Disallow: /is/
15Disallow: /publishing/journals/rssfeed.asp
16Disallow: /pdf/members/newsletters/womenchemists_apr02.pdf
17Disallow: /AboutUs\News/PressReleases/2009/UVToothBleaching.asp
18Disallow: /Publishing/ChemScience/Volume/2009/03/Turning_the_light_off_on_tooth_bleaching.asp
19Disallow: /Publishing/EdSymp/
20Disallow: /Publishing/ATHENS_index.asp
21Disallow: /images/EdSymp2010_reportforweb_tcm18-185058.pdf
22Disallow: /Labs/
23Disallow: /placesofchemistry/
24Disallow: /rsc-id/
25
26# Editors symposium files
27Disallow: /images/WorkshopA_Impact_tcm18-177392.ppt
28Disallow: /images/WorkshopB_EditorialBoards_tcm18-177393.ppt
29Disallow: /images/_WorkshopC_peer%20review%20workshop_tcm18-179104.ppt
30Disallow: /images/WorkshopD_ChemSpider_tcm18-177395.ppt
31Disallow: /images/WorkshopE_eplatform_tcm18-177396.ppt
32Disallow: /images/WorkshopF_Intl%20Dev_tcm18-177397.ppt
33Disallow: /images/WorkshopG_SUNAM_RSCEditors_tcm18-177398.ppt
34Disallow: /images/WorkshopH_SocialMedia_tcm18-177399.ppt
35Disallow: /images/WorkshopI_OpenAccess_tcm18-177400.ppt
36Disallow: /images/WorkshopJ_CelinaRamjoue_tcm18-177401.ppt
37
38# allow contracted search
39ACAP-crawler: gsa-crawler
40# User-agent: gsa-crawler
41# block GuideBot
42ACAP-crawler: Guidebot
43# User-agent: Guidebot
44ACAP-disallow-crawl: /
45# Disallow: /
46# block robots
47ACAP-crawler: *
48# User-agent: *
49ACAP-disallow-crawl: /Membership/Memberzone/
50ACAP-disallow-crawl: /Labs/
51ACAP-disallow-crawl: /placesofchemistry/
52# Disallow: /Membership/Memberzone/
53ACAP-disallow-crawl: /is/
54# Disallow: /is/
55ACAP-disallow-crawl: /publishing/journals/rssfeed.asp
56# Disallow: /publishing/journals/rssfeed.asp
57
58
59# Yahoo crawl
60User-agent: Slurp
61crawl-delay: 30
62
63#Conference Pages
64Disallow: /membership/benefits/join_acs.asp
65Disallow: /chemistryworld/subscribe_acs.asp
66
67#Exam File for Robert Bowles
68Disallow: /Education/SchoolStudents/Olympiad/paper2011.asp
69
70# e-Membership
71Disallow: /Membership/e-Membership/app-help.asp
72
73#HD75942 11:11 08/02/2012
74Disallow: /suppdata/
75
76# Denial URLs
77
78Disallow: /chemistryworld/_denial.asp
79Disallow: /education/eic/_denial.asp
80Disallow: /publishing/_denial.asp
81Disallow: /publishing/currentawareness/_denial.asp
82Disallow: /publishing/journals/_denial.asp
83Disallow: /membership/_denial.asp
84
85# Block AhrefsBot and AhrefsSiteAudit
86User-agent: AhrefsBot
87Disallow: /
88
89User-agent: AhrefsSiteAudit
90Disallow: /
91
92Sitemap: https://www.rsc.org/sitemap.xml

What do the bots actually get?

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

History

Questions

Does rsc.org block GPTBot?

No. rsc.org’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 rsc.org block ClaudeBot?

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

Does rsc.org block Google-Extended?

No. rsc.org’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 rsc.org block PerplexityBot?

No. rsc.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 rsc.org?

Yes. rsc.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.