Who blocks AI · #1071 in the Majestic Million

robots.txt · checked 9 Nov 2026

Does dictionary.com block AI crawlers?

Yes. dictionary.com’s robots.txt blocks 3 of the 19 AI crawlers we track, including GPTBot, CCBot and Applebot-Extended. Search engines such as Googlebot and Bingbot may crawl it.

GPTBotBlocked OAI-SearchBotAllowed ClaudeBotAllowed PerplexityBotAllowed Google-ExtendedAllowed CCBotBlocked

robots.txt: www.dictionary.com/robots.txt · 38 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	line 29 · `Allow: /` under `User-agent: *`
`Bingbot`	Microsoft	Allowed	line 29 · `Allow: /` under `User-agent: *`
`DuckDuckBot`	DuckDuckGo	Allowed	line 29 · `Allow: /` under `User-agent: *`
`Applebot`	Apple	Allowed	line 29 · `Allow: /` under `User-agent: *`
`PetalBot`	Huawei	Allowed	line 29 · `Allow: /` under `User-agent: *`
`YandexBot`	Yandex	Allowed	line 29 · `Allow: /` under `User-agent: *`
`Baiduspider`	Baidu	Allowed	line 29 · `Allow: /` under `User-agent: *`

AI search

Bot	Operator	robots.txt	Deciding line
`OAI-SearchBot`	OpenAI	Allowed	line 29 · `Allow: /` under `User-agent: *`
`PerplexityBot`	Perplexity	Allowed	line 29 · `Allow: /` under `User-agent: *`
`Claude-SearchBot`	Anthropic	Allowed	line 29 · `Allow: /` under `User-agent: *`
`DuckAssistBot`	DuckDuckGo	Allowed	line 29 · `Allow: /` under `User-agent: *`
`Amazonbot`	Amazon	Allowed	line 29 · `Allow: /` under `User-agent: *`
`YouBot`	You.com	Allowed	line 29 · `Allow: /` under `User-agent: *`

AI training

Bot	Operator	robots.txt	Deciding line
`GPTBot`	OpenAI	Blocked	line 4 · `Disallow: /` under `User-agent: GPTBot`
`ClaudeBot`	Anthropic	Allowed	line 29 · `Allow: /` under `User-agent: *`
`Google-Extended`	Google	Allowed	line 29 · `Allow: /` under `User-agent: *`
`CCBot`	Common Crawl	Blocked	line 7 · `Disallow: /` under `User-agent: CCBot`
`Applebot-Extended`	Apple	Blocked	line 16 · `Disallow: /` under `User-agent: Applebot-Extended`
`GoogleOther`	Google	Allowed	line 29 · `Allow: /` under `User-agent: *`
`Meta-ExternalAgent`	Meta	Allowed	line 29 · `Allow: /` under `User-agent: *`
`Bytespider`	ByteDance	Allowed	line 29 · `Allow: /` under `User-agent: *`

User-triggered fetchers

Bot	Operator	robots.txt	Deciding line
`ChatGPT-User`	OpenAI	Allowed	line 29 · `Allow: /` under `User-agent: *`
`Claude-User`	Anthropic	Allowed	line 29 · `Allow: /` under `User-agent: *`
`Perplexity-User`	Perplexity	Allowed	line 29 · `Allow: /` under `User-agent: *`
`MistralAI-User`	Mistral	Allowed	line 29 · `Allow: /` under `User-agent: *`
`Meta-ExternalFetcher`	Meta	Allowed	line 29 · `Allow: /` under `User-agent: *`

SEO tools

Bot	Operator	robots.txt	Deciding line
`AhrefsBot`	Ahrefs	Allowed	line 29 · `Allow: /` under `User-agent: *`
`SemrushBot`	Semrush	Allowed	line 29 · `Allow: /` under `User-agent: *`
`MJ12bot`	Majestic	Allowed	line 29 · `Allow: /` under `User-agent: *`
`DotBot`	Moz	Allowed	line 29 · `Allow: /` under `User-agent: *`

View www.dictionary.com/robots.txt · 38 lines

2# Production version 2025-12-08

3User-agent: GPTBot

4Disallow: /

6User-agent: CCBot

7Disallow: /

9User-agent: deepcrawl

10Disallow: /

12User-agent: seerbot/1.0

13Disallow: /

15User-agent: Applebot-Extended

16Disallow: /

18User-agent: *

19Disallow: /5480.iac.

20Disallow: /go/

21Disallow: /audio.html/

22Disallow: /houseads/

23Disallow: /askhome/

24Disallow: /23219321/iac.

25Disallow: /t2opt/

26Disallow: /*,*

27Disallow: /browse-2/

29Allow: /

31# Allow ad scanning

32Allow: /ads.txt

33Allow: /app-ads.txt

35User-agent: AmazonAdBot

36Crawl-Delay: 60

38Sitemap: https://www.dictionary.com/sitemap_index.xml

What do the bots actually get?

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

History

19 October 2026: first checked.

Questions

Does dictionary.com block GPTBot?

Yes. dictionary.com’s robots.txt disallows GPTBot from the whole site (line 4: 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 dictionary.com block ClaudeBot?

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

Does dictionary.com block Google-Extended?

No. dictionary.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 dictionary.com block PerplexityBot?

No. dictionary.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 dictionary.com?

Yes. dictionary.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.