Google Re-indexed Old Domain After Site Migration
Website operators should verify index consistency in Search Console following a domain move to avoid traffic losses.
Updated on Oct. 13, 2026 in Marketing
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In August 2026, Google re-indexed an old domain four months after a site owner migrated to a new URL. This reversal caused a significant drop in traffic for the new site, highlighting potential pitfalls in search engine domain transitions.
Why it matters
Index instability after a migration can result in a sudden collapse of search impressions and clicks. For operators, this creates an urgent need to audit search performance metrics when search engine algorithms prioritize legacy domains over active ones.
The new domain saw daily impressions crash from 5,000 in April to just 20 per week following the re-indexing event. During this disruption, Google categorized over 5,000 pages on the new domain as crawled but not indexed.
The players
The search engine provider that manages indexation and domain authority protocols for the majority of global web traffic.
Google Search Console
The official interface used by website operators to monitor performance, indexation status, and technical SEO health.
The details
Despite the implementation of redirects and the use of the Google Change of Address tool, the search engine ultimately reverted its indexing to the old domain. This led to traffic migrating back to the legacy URL, which is now appearing in search results instead of the intended destination. The shift leaves the new domain with negligible visibility, forcing operators to reconcile discrepancies between their intended site architecture and the search engine's current index state.
Timeline
January 2026: Website migration was initiated.
April 2026: Traffic on the new domain reached 5,000 impressions per day.
August 2026: Google re-indexed the old domain, causing traffic to decline.
Market Landscape
This event highlights a failure in the expected performance of Google's Change of Address tool, which is intended to signal a permanent site transfer to search crawlers. It underscores the ongoing challenges operators face when search engine algorithms conflict with standard SEO migration best practices.
Operators who have recently migrated domains should proactively monitor Search Console for unexpected index reversion to the old site. If re-indexing occurs, prioritize checking redirect configurations and re-submitting updated sitemaps to signal the intended primary domain.
The takeaway
Technical domain migrations carry persistent risks of index reversion even after successful implementation. Operators should keep their old domain redirects active indefinitely and audit search console data periodically to detect shifts in index priority early.
Further reading
Learn more about managing your search presence in the Marketing section.
Source note: This article includes information reported by Search Engine Roundtable.
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Do you trust search engines to accurately maintain your website traffic after a domain migration?
