AI-Disclosure Header on new websites

Proposed IETF HTTP response header that discloses whether and how AI was involved in producing a page.

Sites using AI-Disclosure Header
2
since May 2026
Last 30 days
0.0%
of new sites, to Oct 23
no change on the 30 days before
Last 7 days
0.0%
of new sites, 7-day average
no change on the week before
Rank in Protocol
#12
of 23 tools, all time
First seen May 7, 2026
Last seen Oct 19, 2026

What we found

  1. AI-Disclosure Header appeared on 1 new site in the last 30 days.[1]

Share of new sites using AI-Disclosure Header

0.0000% 0.0001% 0.0002% 0.0003% 12 Oct

The line is the 7-day average share of new sites that use AI-Disclosure Header, since 12 October. It starts at our first detection.

Protocol on new sites

# Movement Tool Share of all sites Share of category Bar
1 – HTTP/3 50.6% >99.9%
2 – Tor Onion Service <0.1% <0.1%
3 ▼3 United States Semantic Standard <0.1% <0.1%
4 ▼1 I2P <0.1% <0.1%
5 ▼1 njump <0.1% <0.1%
6 TDM Reservation Protocol <0.1% <0.1%
7 ▼3 AT Protocol <0.1% <0.1%
8 ▲7 carbon.txt <0.1% <0.1%
9 ▼1 WebTorrent Tracker <0.1% <0.1%
10 ▲7 Agent2Agent Protocol <0.1% <0.1%
11 Agent2Agent (A2A) Protocol <0.1% <0.1%
12 AI-Disclosure Header <0.1% <0.1%

All-time shares across the new sites we track: of all of them, and of the sites using any Protocol tool. All 23 in Protocol

Recently launched products built on AI-Disclosure Header

2 of the 2 sites using AI-Disclosure Header are product launches we list individually.

Site Found Also detected
Law of SI — AI Law & Regulation Tracker — English · 简体中文 · Español · Français · Deutsch · 日本語 · Italiano lawofsi.com Oct 19 Cloudflare
Velasong — AI Song Gifts velasong.com · Content · United States May 7 Next.js React Vercel GoDaddy DNS

Notes

  1. These figures cover websites that went live since April 2026, not the web as a whole.

How this page is made

FirstSited looks at each new website near the day it goes live and records what it was built with. We do not go back later, so these figures describe what sites launch with, not what they run today. A site counts towards AI-Disclosure Header when we detect AI-Disclosure Header on it at that look.

Every share on this page is a proportion of the new sites we were tracking at the time. Sites we found across the wider web count towards the figures, but only product launches are listed by name. How we detect technologies · How we find new sites

Something not look right? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.