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Subdomains

See all subdomains of any domain with their individual keyword counts, visibility scores, and estimated traffic — useful for auditing large sites.

Written by Mike

Analyze Every Subdomain's SEO Footprint

The Subdomains report lists all subdomains detected for a root domain, each with its own keyword count, visibility score, and estimated traffic. It's the fastest way to understand how a large site distributes its organic presence — or to check if a competitor's blog, shop, or support site is eating into your keyword space.

What you can achieve:

  • Audit your own site's subdomain structure: Identify which subdomains are driving organic traffic and which are invisible to search engines.

  • Analyze competitor subdomains: Discover if a rival is using a separate subdomain (e.g., blog.competitor.com) to dominate content in your niche.

  • Detect orphaned or underperforming subdomains: Find subdomains with zero visibility that may be wasting crawl budget or creating duplicate content issues.

Getting Started

  1. Navigate to Site Analysis → Subdomains in the left sidebar.

  2. Enter the root domain (e.g., example.com) and select your regional database.

  3. Click Search. The report lists all detected subdomains with their SEO metrics.

  4. Click any subdomain in the table to run a full Site Analysis on that subdomain specifically.

  5. Use the export button to download the full subdomain list with metrics for your records.

Subdomains report — table with subdomain names, keyword count, visibility, and traffic columns

Key Metrics Explained

  1. Subdomain: The full subdomain URL (e.g., blog.example.com, shop.example.com). Click any entry to drill into its keyword data.

  2. Keywords: The number of queries for which this subdomain appears in the Top 100.

  3. Visibility: The subdomain's prominence in search results, weighted by search volume of its ranked keywords.

  4. Estimated Traffic: Predicted monthly organic visits to this subdomain specifically.

  5. SDR: Authority score for the subdomain. Note that subdomains often have lower SDR than the root domain.

Pro Tip: Find a Competitor's Hidden Content Engine

Many top-ranking sites hide their best SEO strategy behind a subdomain. This workflow exposes it.

  1. Run Subdomains on a major competitor in your niche.

  2. Sort by Keywords or Visibility (descending) to find their highest-traffic subdomain.

  3. Click that subdomain to open its full Keywords report.

  4. The goal: A competitor's blog or resource subdomain often ranks for thousands of informational keywords. These are your content gap opportunities.

⚠️ Important: Serpstat detects subdomains based on its crawl data. Subdomains with very low traffic or those recently created may not appear in the report. For a complete technical audit of your own subdomains, combine this report with Site Audit.

❓ Frequently Asked Questions

Q: Why don't I see all subdomains of my site in the report?
​A: Serpstat only shows subdomains that rank for at least one keyword in its database. Subdomains with no organic rankings or very recent subdomains may not appear.
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Q: Can I analyze a subdomain directly instead of through this report?
​A: Yes — enter the subdomain URL directly into the search bar in any Site Analysis report (e.g., blog.example.com) to analyze it in isolation.
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Q: Does www count as a subdomain?
​A: Yes, www.example.com is technically a subdomain. If your site uses www, it will appear in this list. Serpstat typically treats the www and root domain as the same entity, but it depends on how they're set up.

Next Steps

  • Keywords — Click into any subdomain to explore its full keyword ranking list.

  • Top Pages — See which specific pages on a subdomain are driving the most traffic.

  • Site Audit — Run a technical audit on any subdomain to find crawling and indexation issues.

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