# Orphan pages

Canonical HTML: /atlas/orphan-pages
Atlas version: atlas-2026-07-28-v1
Category: Discovery and crawl frontiers

## Definition

An orphan page has no crawlable inbound link from the connected site graph.

## How it works

It may still be found through a sitemap, an external link, a feed, a historical index, or a direct submission. Those discovery channels should be measured separately.

## How to validate it

Derive the HTML link graph from served content, verify zero inbound edges, and compare sitemap fetch time with the orphan page’s first request.

## Common failure

Calling a URL an orphan while actively submitting it through IndexNow confounds sitemap discovery with direct notification.

## Related topics

- [Sitemap discovery](/atlas/sitemap-discovery)
- [Internal link discovery](/atlas/internal-links)