🛠️ How It Works – Merge Subs & Domains

1. Paste Your Sub-domains – Insert your list of sub-domains into the first input box.
2. Paste Your Domains – Insert your list of (main) domains into the second input box.
3. Click “Merge Subs & Domains” – The tool will pair each sub-domain with each domain to generate full hostnames.
4. View Results – See the counts for input sub-domains, domains, and total merged output lines.
5. Get Your Hostnames – A clean list of merged sub-domain + domain combinations appears instantly.
6. Copy or Download – Capture your merged output for easy use or storage.

⚡ Why Use a Merge Subs & Domains Tool?

• Effortless Combination – Automatically build full hostnames by merging sub-domains with domains.
• Time-Saving – Skip manual concatenation; generate hundreds of combinations instantly.
• Reliable Output – Accurate pairing every time, with clear counts for verification.

💡 Tips for Best Results

• Paste each sub-domain or domain on a separate line to ensure proper merging.
• Use alongside tools like Clean Sub-domains or Sort Text Lines to refine your lists before merging.
• Check the displayed line counts to validate the number of combinations generated.

❓ Frequently Asked Questions

What does the Merge Subs & Domains tool do?

It takes two lists—sub-domains and domains—and combines them pairwise to generate full hostnames (e.g. mail.example.com).

How do I merge sub-domains and domains online?

Paste sub-domains and domains into the respective boxes, click Merge Subs & Domains, and you'll immediately see the stats (input counts and result count), plus a list of merged hostnames.

Is this tool safe to use?

Yes ✅ Processing happens entirely in your browser—no data is uploaded or stored.