Site profile

w3.org

W3C

Technologies

Found on any of its indexed pages. Each one lists every other site that uses it.

Analytics, ad and verification IDs in its source. Sites sharing one are usually run by the same people.

None found.

Email addresses, phone links and social profiles it publishes.

2 email addresses, 1 social profile. Sign in to see them, free.

From the response headers and meta tags of its homepage.

DNS, certificate and favicon, with when each was seen. Shared ones lead to the other sites behind them.

Addresses: 104.18.22.19only this site
104.18.23.19only this site
2606:4700::6812:1613
2606:4700::6812:1713
Mail (MX): pan.w3.orgonly this site
puck.w3.orgonly this site
Name servers: jamie.ns.cloudflare.com6 other sites
pranab.ns.cloudflare.com3 other sites
Certificate issuer: C = US, O = Google Trust Services, CN = WE1
Valid until: Dec 5, 2026
Certificate: 1da7af5dd82a1eb10e0c0031129161f4only this site
Names it covers: *.w3.org w3.org
Favicon: 932967759only this site
TXT records: 853C844562
anthropic-domain-verification-xwqnyg=KpEpoEkHUmXnsWC0mhnfKFBrr
ca3-d6556337888945edac9c159a068c46a2
google-site-verification=5TpwKtmzdpa5fntQgKHY96mTJ3FiSn9fGp07XKxFsMk

Who its ads.txt and app-ads.txt let sell its ad space directly. Sites sharing a seller account usually share an owner.

No ads.txt or app-ads.txt with direct sellers.

What it publishes for machines. Every version is archived.

What the archive holds about it.

Fetched 3 times since Oct 17, 2026, 3 successfully. The archive holds 3 distinct versions of 3 pages: every change is kept.

The most popular first.

Other sites its pages link to, by how many of its pages do.