What is ContextualBot?

ContextualBot is a bot in the advertising and marketing bots category, operated by Outcomes.

Bot name
ContextualBot
Operator
Outcomes
Type
Bot
Respects robots.txt
Not confirmed
robots.txt user agent
ContextualBot
Signs requests (Web Bot Auth)
No

About ContextualBot

Accesses page content to create contextual segments for targeting within several DPS & SSP platforms.

Advertising bots review landing pages, check ad placements and classify pages for brand safety and contextual targeting. Blocking ad verification bots can stop your ads or your inventory from serving, so allow the ones your ad partners use.

ContextualBot user agent

ContextualBot identifies itself with this user agent string:

  • Mozilla/5.0 (compatible; ContextualBot/ 1.0; +http://outcomes.net).

Anyone can copy a user agent string. Transfon Security also checks where each request comes from, so a request that claims to be a known crawler but comes from the wrong network is treated as a fake, not as the real crawler.

How to block ContextualBot in robots.txt

We have not confirmed whether ContextualBot follows robots.txt. Add a rule, then check your logs to see that it stopped. robots.txt is a plain text file at the root of your domain, such as https://example.com/robots.txt.

Block ContextualBot from the whole site

User-agent: ContextualBot
Disallow: /

Block ContextualBot from some folders

User-agent: ContextualBot
Disallow: /private/
Disallow: /search

Allow ContextualBot only on some folders

User-agent: ContextualBot
Allow: /blog/
Disallow: /

Allow ContextualBot and block other crawlers

User-agent: ContextualBot
Allow: /

User-agent: *
Disallow: /

Things to know

  • Each host needs its own file. Rules on www.example.com do not apply to shop.example.com.
  • A crawler obeys only the most specific group that names it. Once you add a User-agent: ContextualBot group, ContextualBot ignores your User-agent: * rules, so repeat any that should still apply.
  • The user agent name is not case sensitive. We take ContextualBot from ContextualBot's user agent; check Outcomes's own documentation if it publishes a different robots.txt name.
  • Crawlers cache robots.txt, so changes can take up to a day to apply. Disallow stops crawling but does not remove pages already collected or indexed.

Limits of robots.txt

  1. ContextualBot may not follow the rule. robots.txt is a request that nothing enforces, and we have not confirmed that ContextualBot follows it. Check your logs after adding a rule.
  2. The user agent could be fake. robots.txt matches the name a request claims. Anyone can send ContextualBot's user agent, and a scraper using it is not bound by Outcomes's robots.txt policy. Only checking the source network tells a real ContextualBot from a fake one.

Treat robots.txt as a statement of your policy, and enforce it where requests arrive.

Who should care about ContextualBot

Publishers

Ad verification and contextual crawlers like ContextualBot can decide whether your pages get demand. Blocking the ones your partners use can lower fill rates.

Transfon Security for publishers

Media buyers and advertisers

ContextualBot checks pages for ad platforms. Its visits to landing pages are not users, so exclude them from conversion data.

Transfon Security for advertisers

E-commerce

Ad platforms send crawlers like ContextualBot to check product landing pages. Keep it allowed so ads are not disapproved, and out of analytics.

Transfon Security for e-commerce

SaaS and APIs

Allow ContextualBot on landing pages linked from your ads, and keep it off the app.

Transfon Security for SaaS and APIs

Block ContextualBot with Transfon Security

robots.txt is a request, not an enforcement. Transfon Security shows ContextualBot by name in the Top Bots report, so you can see how often it visits and which pages it reads. Block or allow it with a User Agent rule, or slow it down with a rate limit decision rule.

Transfon Security

Control ContextualBot on your site

  • See every ContextualBot visit and the pages it reads
  • Spot bots that fake trusted crawler names
  • Block, allow or rate limit ContextualBot with one rule
  • Works with or without robots.txt support

Frequently asked questions

What is ContextualBot?

ContextualBot is a bot in the advertising and marketing bots category, operated by Outcomes. Accesses page content to create contextual segments for targeting within several DPS & SSP platforms.

Does ContextualBot respect robots.txt?

We have not confirmed whether ContextualBot follows robots.txt. Add a robots.txt rule, then check your logs to see that it stopped, and block it by user agent if it did not.

How do I block ContextualBot?

Add "User-agent: ContextualBot" followed by "Disallow: /" to the robots.txt file at the root of your site. To enforce it, block requests whose user agent contains "ContextualBot" at your WAF. In Transfon Security that is one User Agent block rule.

Is robots.txt enough to block ContextualBot?

No. robots.txt is voluntary, so ContextualBot may not follow it, and anyone can send ContextualBot's user agent, so a fake ContextualBot ignores your rule. Enforce the rule where requests arrive, at your WAF, and check the source network.

Should I block ContextualBot?

Advertising bots review landing pages, check ad placements and classify pages for brand safety and contextual targeting. Blocking ad verification bots can stop your ads or your inventory from serving, so allow the ones your ad partners use.

Related bots

All advertising and marketing bots · Full bot directory

See Which Bots Visit Your Site

Transfon Security identifies every bot in this directory in your traffic reports, flags fake search crawlers, and lets you allow, block or rate limit each bot.

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