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Class C IP Checker

Inspect the Class C block distribution of server IP addresses for multiple domains.
✓ Free✓ No signup✓ Privacy first✓ Runs in your browser

How it works

Check subnets in three steps

1. Input domain list

Paste the target website domain URLs (one per line) in the input field.

2. Execute lookup

Find the server IP address and parse the Class C subnet block for each domain.

3. Review distribution

Review the results table showing the hosting block breakdown for your domains.

FAQ

Common questions

An IP address (like 192.168.1.100) has four segments. The third segment (1) represents the Class C subnet block. Shared hosting setups and single data centers often group servers within the same Class C block.
If all your backlink domains share the same Class C IP block, search engines may flag them as a private blog network (PBN) managed by one owner, reducing their SEO value.
The checker identifies the host IP addresses for all submitted domains, highlighting duplicate subnets so you can confirm your backlinks are hosted on diverse networks.
Focus on acquiring links from websites hosted with different providers and in different regions to diversify your backlink profile.

Keep going

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About the Class C IP Checker

Building a natural link profile requires keeping your backlink sources diverse. This utility analyzes the host subnets for multiple domains at once, helping you spot duplicate IP blocks that could trigger search engine spam filters.

Benefits

  • Spot PBN footprints — Detect duplicate Class C blocks in your backlink profiles.
  • Diversify link sources — Confirm that your referral traffic comes from a variety of hosting networks.
  • Audit hosting providers — Check if your domains are distributed across different data centers.
  • Protect domain trust — Monitor subnet footprints to keep your site's SEO profile healthy.

Privacy

Queries resolve using secure public servers and no domain data is saved.