# State of llms.txt — September 2026: 2 of the Tranco top-30 serve a valid file

> Monthly fixed-cohort tracker: 2/30 Tranco-head domains serve a spec-valid llms.txt (6.7%). Unchanged from the 2026-08-01 snapshot (2/30).

Source: https://geoplaybooks.com/blog/state-of-llms-txt-2026-09/

# State of llms.txt — September 2026: 2 of the Tranco top-30 serve a valid file

Our monthly tracker re-checked /llms.txt on the same fixed cohort — the Tranco top-30 (list 94Y92) — on 2026-09-01. This note is generated from the logged snapshot, nothing else.

## The numbers

- **2 of 30** domains serve a spec-valid llms.txt (6.7%)

- **9** serve something at /llms.txt at all (valid or malformed)

- **1** were unreachable to our probe this run

- Unchanged from the 2026-08-01 snapshot (2/30).

## Why a fixed cohort

Same 30 domains every month means the line is comparable — adoption movement, not sampling noise. The heavier top-1,000 baseline (8.5% valid) lives in the [full data study](/data/llms-txt-adoption-2026/), dataset downloadable under CC BY 4.0.

## Check your own

The spec is cheap to satisfy and most of the web still hasn't: validate yours with the [llms.txt validator](/tools/llms-txt-validator/), or generate a spec-valid file in the browser with the [generator](/tools/llms-txt-generator/). The five signals AI engines actually need are covered by the [free checker](/check/).