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 13 hours ago

Insights

Top Website Robots.txts

0%
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

The percentage of all internet traffic coming from Developer Helpers

Top Visited Website Categories

Travel and Transportation
Hobbies and Leisure
Sports
Arts and Entertainment
People and Society
Get These Insights for Your Website
Use the WordPress plugin, Node.js package, or API to get started in seconds.

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.

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: /