Does YandexAdditional respect robots.txt?

Yes. The operator documents that YandexAdditional reads robots.txt and follows Disallow rules for its own token. Rules take effect on the next fetch of the file, which can be hours or days after you publish them.

How do I verify a request really came from YandexAdditional?

Yandex documents a reverse-then-forward DNS check against yandex.ru, yandex.net and yandex.com hostnames. The same check covers the YandexGPT crawlers. The reference is published at https://yandex.com/support/webmaster/robot-workings/check-yandex-robots.html.

How do I block YandexAdditional?

Add these user-agent tokens (YandexAdditional, YandexAdditionalBot) to robots.txt with Disallow: /. If the crawler ignores robots.txt, match the user agent at your CDN or reverse proxy and return 403 there instead.

IPScanner

Data scrapers and resellers

YandexAdditional

YandexAdditional is a bot operated by Yandex that crawls pages into a dataset that is then reused or sold. Retrieves data used for YandexGPT quick answers features. It honours robots.txt, and a request claiming to be YandexAdditional can be checked against a forward-confirmed reverse DNS lookup.

Also seen as YandexAdditionalBot. Rules need to cover every token.

YandexAdditional at a glance

Reference data for the YandexAdditional crawler
User agent	`YandexAdditional` Token only. The operator has not published a full user-agent string, so match on the substring rather than an exact header.
Operator	Yandex
Purpose	Scrapes/analyzes data for the YandexGPT LLM.
Respects robots.txt	Yes, documentedsource
Verification method	Reverse DNS, forward confirmed Yandex documents a reverse-then-forward DNS check against yandex.ru, yandex.net and yandex.com hostnames. The same check covers the YandexGPT crawlers. https://yandex.com/support/webmaster/robot-workings/check-yandex-robots.html
Crawl pattern	Not published
Robots.txt tokens	`YandexAdditionalYandexAdditionalBot`
Operator documentation	None published

Retrieves data used for YandexGPT quick answers features.

robots.txt

Allow or block YandexAdditional

Paste one of these into the robots.txt file at the root of your domain. Rules are per token, so a block on one crawler leaves every other bot untouched.

Block YandexAdditional

User-agent: YandexAdditional
User-agent: YandexAdditionalBot
Disallow: /

Blocks every path for this crawler only.

Allow YandexAdditional

User-agent: YandexAdditional
User-agent: YandexAdditionalBot
Allow: /

Explicit allow. Useful when a wildcard rule above it would otherwise catch this crawler.

Allow, except the pages you never want quoted

User-agent: YandexAdditional
User-agent: YandexAdditionalBot
Allow: /
Disallow: /account/
Disallow: /checkout/
Disallow: /search

Edit the Disallow paths to match your own account, checkout and search URLs.

What blocking actually costs you

Blocking YandexAdditional stops your content being packaged and resold to third parties. Whoever bought earlier crawls still has them.

Block every crawler in the directory at once

Verification

Is that really YandexAdditional?

A user-agent header is a string the client chooses. Scrapers copy YandexAdditional precisely because site owners allow it. Yandex documents a reverse-then-forward DNS check against yandex.ru, yandex.net and yandex.com hostnames. The same check covers the YandexGPT crawlers.

Paste the IP address from your access log below. You will see whether it belongs to a hosting provider, a residential proxy pool or a Tor exit, plus the ASN that announces it, which is what tells you whether the claim holds up.

Datacenter IP detectionNearly every real AI crawler egresses from cloud ranges. A residential IP claiming to be one is the first thing to check.IP reputation checkSee whether the address behind a fake crawler hit has a history of abuse elsewhere.Residential proxy detectionScrapers that get blocked by user agent often come back through residential proxy pools.

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Agentscan

Identify crawlers automatically instead of by hand

Agentscan checks a request against published crawler ranges, reverse DNS and hosting data, then returns a verdict your edge can act on. One call per request, no range files to keep up to date.

How Agentscan works API reference Pricing What is my IP

FAQ