DuplexWeb-Google fetcher
DuplexWeb-Google is a Google user agent linked to Duplex on the web features. It is documented among Google's crawlers and fetchers as a special-case agent rather than the search crawler. Because Duplex on the web has limited public footprint, exact current behaviour is not fully documented, so this entry is partially verified and avoids inventing specifics.
What this means
DuplexWeb-Google is associated with Google's Duplex on the web functionality and is listed among Google's crawlers and fetchers as a special-case agent. It is not the search-index crawler.
Duplex on the web has had limited public availability, and Google does not exhaustively document this agent's current triggers, so this page states only what the crawler list supports and marks the rest unverified.
How it identifies itself
It uses the user-agent token DuplexWeb-Google and appears in Google's crawlers/fetchers documentation. Match on the stable token rather than a version string.
Verify the source IP against Google's published ranges where authenticity matters, since the user agent can be copied.
- User-agent token: DuplexWeb-Google
- Associated with Duplex on the web
- Not the Googlebot search crawler
How it appears in analytics and logs
A request carrying the DuplexWeb-Google token is a Google product fetcher associated with Duplex on the web, not Googlebot indexing. Treat it as Google automation, not crawl coverage.
Diagnostic use case
Recognise DuplexWeb-Google in logs as a Google product fetcher distinct from Googlebot, and verify it against Google's published ranges.
What WebmasterID can help detect
WebmasterID classifies DuplexWeb-Google as a Google fetcher separate from Googlebot so it does not blend into search-crawl coverage or human analytics.
Common mistakes
- Assuming DuplexWeb-Google performs search indexing.
- Inventing current behaviour beyond Google's documentation.
- Trusting the token without IP verification.
Privacy and accuracy notes
DuplexWeb-Google is identified by its user-agent token only. It is automation, not a person; WebmasterID records it as a bot event with no human identity attached.
Related pages
- GoogleProducer fetcher
GoogleProducer is a user agent that appears among Google's crawlers and fetchers and is used by Google product infrastructure rather than the search index. It is documented by Google as one of the special-case Google agents. Some specifics of when it fetches are not exhaustively published, so it is recorded here as partially verified to avoid inventing behaviour.
- APIs-Google fetcher
APIs-Google is a Google fetcher user agent used when Google products send push notifications or other API-driven requests to a developer's server — for example a PubSubHubbub (WebSub) delivery. It is not the search crawler and is not used to build the search index. Google documents it in the list of Google crawlers and fetchers, and it is verifiable against Google's published crawler IP ranges.
- Google-Read-Aloud fetcher
Google-Read-Aloud is a user-triggered Google fetcher that retrieves a page so Google can convert its text to speech and read it aloud to a user. It is documented among Google's user-triggered fetchers, is not the search crawler, and because it acts on a user's request it generally ignores robots.txt the way other user-triggered fetchers do.
- Bot intelligence
Deterministic categorisation of Google fetchers and crawlers.
Sources and verification notes
- Google Search Central — Google crawlers and fetchers overviewDuplexWeb-Google listed; current trigger behaviour not exhaustively documented.
Last reviewed 2026-06-24. Facts are checked against primary/official sources where available; uncertain specifics are marked “Data not yet verified” rather than guessed.