Extension Domains
| Category | AI-search tactic / concept |
|---|---|
| Introduced | 2026 |
| Attributed to | Koray Tuğberk Gübür entity home · about/bio |
| Attribution status | First-person terminology |
| Attribution confidence | Medium-High |
| Original source | linkedin.com |
| Related concepts | |
| Wasteful Domains Corpus Engineering Search Everywhere Optimization Digital Authority Management | |
Extension Domains is a ai-search tactic / concept used in AI SEO. Secondary domains used to extend a brand's influence into topical/query spaces the main domain cannot easily penetrate. The term or framework is attributed to Koray Tuğberk Gübür and is documented in 2026.[1]
AI SEO Wiki records the attribution as First-person terminology, with a confidence rating of Medium-High. This rating concerns the documentary evidence for the term's origin; it does not imply that the underlying idea is unique to one practitioner or that the terminology has become an industry standard.[2]
Definition
Secondary domains used to extend a brand's influence into topical/query spaces the main domain cannot easily penetrate. In practical usage, the concept is most useful when its measurement unit, observation window, source set, or decision context is stated explicitly. This is particularly important in AI-mediated search, where answers can vary between models, prompts, retrieval systems, and repeated runs.
Origin and attribution
Extension Domains is attributed in the available documentary record to Koray Tuğberk Gübür. The registry dates the term to 2026 and classifies the evidence as First-person terminology.[1]
Pair with Wasteful Domains as a single taxonomy. This qualification is retained because AI-search terminology often spreads rapidly through conference talks, social posts, vendor material, and practitioner communities before a stable publication record exists.
An additional source provides independent or supporting evidence for the terminology or attribution.[2]
Role in AI SEO
Extension Domains describes a tactic or structural concept that acts outside the narrow boundaries of a single canonical website. Such tactics are relevant because AI systems can construct answers from a wider corpus of third-party sources, mentions, documents, and domains.
This overlaps with Corpus Engineering, Digital Authority Management, and Consensus Gap.
Application and interpretation
The concept is applied by first identifying the observable behaviour it describes, then testing that behaviour across a sufficiently broad set of prompts or sources. It should be used as a model for investigation rather than as a substitute for direct evidence from the relevant search or AI system.
Related concepts
| Concept | Relationship |
|---|---|
| Wasteful Domains | Domains created mainly to manufacture corroborative web evidence/consensus rather than build a durable standalone brand/site. |
| Corpus Engineering | Systems-level shaping of the corpus of evidence, mentions and sources from which AI systems retrieve/form conclusions. |
| Search Everywhere Optimization | Optimizing visibility across all platforms/surfaces where an audience searches and researches. |
| Digital Authority Management | Managing distributed authority signals so search/AI systems understand, trust and prefer a brand/entity. |
Limitations and attribution notes
The attribution for Extension Domains is not treated as absolute. The available evidence supports the stated creator or framework, but earlier unindexed usage, parallel terminology, or a later self-attribution may exist. AI SEO Wiki therefore preserves the confidence rating and source trail rather than presenting the origin as uncontested fact.
The field itself changes rapidly. Model behaviour, retrieval systems, citation interfaces, and measurement tooling can change without the terminology changing, so operational claims should be re-tested against current systems.
See also
References
- Primary/original source for Extension Domains. linkedin.com. https://www.linkedin.com/posts/koray-tugberk-gubur_a-single-page-exact-match-domain-over-500000-activity-7480713068851826688-tI_4.
- Creator/entity home. holisticseo.digital. https://www.holisticseo.digital/.
- Creator biography/about page. holisticseo.digital. https://www.holisticseo.digital/author/koray-tugberk-gubur/.