What is Quantcastbot?
Quantcastbot is Quantcast's web crawler used for advertisement quality assurance and analyzing page content to build Interest-Based Audiences for targeted advertising and audience measurement services. Agent Analytics can track when it visits your website.
Overview
| Operated By | Quantcast |
| Source | Official Website |
| Expected To Follow Robots.txt | Yes |
| Insights Last Updated | July 19, 2026 |
Category
Expected Behavior
Quantcastbot visits with a shopping list. Expect focused, repeated requests to the pages its clients monitor, like pricing, product listings, and announcements, on schedules ranging from hourly to weekly. Sites outside a client's watchlist may never see it at all.
Quantcastbot's User Agent
| User Agent | Quantcastbot/1.0 (+http://www.quantcast.com/bot) |
How To Block Quantcastbot With Robots.txt
Add this rule to your robots.txt file to block Quantcastbot from accessing your entire website, or use Automatic Robots.txt to block all intelligence gatherers at once. You can customize which pages are blocked by swapping out / for a different path.
User-agent: Quantcastbot # https://knownagents.com/agents/quantcastbot
Disallow: /Global Insights for Quantcastbot
As of July 19, 2026, this data reflects agent visits measured across thousands of websites using Agent Analytics, combined with daily scans of the world's top 1000 websites and their robots.txt files.
Robots.txt Blocked Percentage
Country of Origin
Robots.txt Blocking Trend
1% of top websites block Quantcastbot in their robots.txt files.
Overall Intelligence Gatherer Traffic
4.2% of all web traffic came from intelligence gatherers.
Top Visited Website Categories
The types of websites most frequently visited by Quantcastbot.
Frequently Asked Questions
Should I Block Quantcastbot?
Decide who benefits. Quantcastbot collects pricing, product, and brand data for its operator's clients, and those clients can include your competitors. Allow it if visibility in market research matters to you. Block it if you would rather not hand competitors structured data about your business. For comparison, 1% of the top websites we track already have robots.txt rules for Quantcastbot.
Does Quantcastbot Follow Robots.txt Rules?
Yes. Quantcastbot is expected to follow robots.txt rules, so a disallow rule is the right first move. Automatic Robots.txt adds and maintains that rule for you, and Agent Analytics confirms Quantcastbot actually follows it.
Does Quantcastbot Access Private Content?
Public business information is the target. Pricing pages, product listings, and announcements are what its clients pay for. Quantcastbot has no special access, but assume everything you publish openly gets collected.
Why Is Quantcastbot Visiting My Website?
A client of Quantcast is monitoring your market, your brand, or you specifically. Expect Quantcastbot's visits to concentrate on pages with business value, like pricing and product pages.
How Can I Tell if Quantcastbot Is Visiting My Website?
Agent Analytics tracks Quantcastbot visits in real time alongside every other known AI agent, crawler, and scraper. You can also check your server logs for requests whose user agent string contains "Quantcastbot". Look for repeated visits to pricing, product, and news pages. Keep in mind that Quantcastbot doesn't publish a verification method, so any client can claim its user agent string and a log match is a hint rather than proof.