# 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**  
**April 16, 2026**

# 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.

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## 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.

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## 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.

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## 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.

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## 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.

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| ⚠️ **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**. |

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## ❓ 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.

**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.

**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.

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## Next Steps

- [**Keywords**](https://help.serpstat.com/en/articles/14290067-keywords) — Click into any subdomain to explore its full keyword ranking list.
- [**Top Pages**](https://help.serpstat.com/en/articles/14437164-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.