W3C_Validator

What is W3C_Validator?

About

W3C_Validator is a developer helper operated by W3C. If you think this is incorrect or can provide additional detail about its purpose, please contact us. You can see how often W3C_Validator visits your website by setting up Dark Visitors agent analytics.

Expected Behavior

Developer helpers generally visit websites on direct behalf of a user who is evaluating some feature or attribute. Visits can be one-off or part of a larger crawl.

Type

Developer Helper

Used by developers to test website functionality

Detail

Operated By	W3C
Last Updated	3 hours ago

Insights

Top Website Robots.txts

0% of top websites are blocking W3C_Validator

Learn How →

Country of Origin

United States

W3C_Validator normally visits from the United States

Global Traffic

See All Global Bot & LLM Insights →

The percentage of all internet traffic coming from Developer Helpers

Top Visited Website Categories

Food and Drink

Home and Garden

Shopping

Arts and Entertainment

Hobbies and Leisure

Get These Insights for Your Website

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Set Up Agent Analytics

Robots.txt

Should I Block W3C_Validator?

Probably not. Developer helpers are normally used to optimize or find problems with your website.

How Do I Block W3C_Validator?

⚠️ Manual Robots.txt Edits Are Not Scalable

New agents are created every day. Instead, serve a continuously updating robots.txt that blocks new agents automatically.

Set Up Automatic Robots.txt

You can block W3C_Validator or limit its access by setting user agent token rules in your website's robots.txt. Set up Dark Visitors agent analytics to check whether it's actually following them.

User Agent String W3C_Validator/1.305.2.12 libwww-perl/5.64

# robots.txt
# This should block W3C_Validator

User-agent: W3C_Validator
Disallow: /