Subdomains For Regional Sites
Ankit Agarwal · Head of Marketing
Subdomains for regional sites means hosting country or language versions on subdomains such as de.example.com, a common international SEO setup.
What are Subdomains For Regional Sites?
Subdomains for regional sites is an international SEO setup in which each country or language version lives on its own subdomain of the main domain, for example de.example.com for Germany or jp.example.com for Japan. Each subdomain can run on separate hosting or software, which suits companies with independent regional teams, but it adds maintenance and splits signals across hosts.
Google’s documentation lists subdomains as one of three supported structures for multi-regional sites, alongside country-code domains (example.de) and subdirectories (example.com/de/). None is a ranking shortcut; the right choice depends on infrastructure, team ownership and how strongly you need to signal a specific country.
How it works
- Create a subdomain per market, such as uk.example.com, de.example.com and fr-ca.example.com.
- Verify each subdomain in Google Search Console (or use a Domain property covering all of them) and in Bing Webmaster Tools.
- Add hreflang annotations across all versions with absolute URLs and an
x-default. - Localize content and commercial details: language, currency, pricing, contact details, legal terms.
- Interlink: link from the main site and between regional versions through a crawlable selector.
- Submit sitemaps per subdomain so each host’s URLs are discovered.
| Consideration | Subdomains | Subdirectories |
|---|---|---|
| Separate hosting or CMS | Easy | Harder |
| Authority consolidation | Weaker | Stronger |
| Setup and monitoring | More work | Less work |
| Local signal | Moderate | Moderate |
Examples
- A cybersecurity company must host EU customer-facing content on EU servers for contractual reasons. It runs eu.example.com on separate infrastructure with its own CMS, linked to the main site through hreflang and a region selector.
- A SaaS company acquired a German competitor whose site had its own platform. As an interim step, it moves the content to de.example.com, then plans a later migration into /de/ once the platforms are unified.
Best practices
- Choose subdomains for operational reasons, not because of a perceived SEO advantage.
- Keep design, navigation and brand consistent so users and crawlers recognize one company.
- Build links into each subdomain, including from the main domain’s high-authority pages.
- Monitor each host separately for crawl errors, Core Web Vitals and indexing.
Common mistakes
- Launching many regional subdomains with untranslated duplicate content.
- Forgetting reciprocal hreflang links between subdomains.
- Forcing IP-based redirects, which hide regional versions from crawlers.
- Splitting analytics so cross-domain journeys are lost; configure cross-domain measurement.
Related terms
- Subdirectories for Regional Sites
- Hreflang
- ccTLDs
- International SEO Specialist
- Country-Specific Content
- Global SEO Strategy
Sources
- Managing multi-regional and multilingual sites (Google Search Central)
- Tell Google about localized versions of your page (Google Search Central)
- The Ultimate Guide to Multilingual and Multiregional SEO (Search Engine Land)
Frequently asked questions
Do subdomains inherit authority from the main domain?
Google has said it handles subdomains and subdirectories similarly in most cases, but in practice subdomains are crawled and evaluated as separate hosts, and many SEOs see new subdomains take longer to perform than new folders. Strong internal linking between the main site and each subdomain helps.
When do subdomains make sense for regional sites?
They make sense when a market needs separate infrastructure: a different CMS, hosting in a specific country for legal or data-residency reasons, or an independent local team with its own release process. If none of these apply, subdirectories are usually simpler.
How do I set up hreflang across subdomains?
Each page lists all its language or regional alternates, including itself, with fully qualified URLs, for example https://de.example.com/preise and https://example.com/pricing. Every alternate must link back. You can place annotations in HTML head, HTTP headers or XML sitemaps.
