How to use it
- Enter up to ten non-empty lines in the bulk text area.
- Solve the displayed math CAPTCHA.
- Select Extract and Process Domains.
- Check the unique-domain count and each syntax badge.
- Copy the output table if you need the validated inventory.
The Valid RFC badge reflects the page's regular expression only; it does not check DNS, registration, total hostname length, IDNs, or every RFC rule.
What is the purpose of the tool
This validator helps administrators and list managers clean a small pasted batch and identify matches that satisfy basic label-edge and length rules.
The shared bulk interface limits input to ten non-empty lines and requires a math CAPTCHA before local processing.
What parameters it generates in output
Processed Inventory reports the number of unique matches. # numbers each row.
Identified Domain / Host is the lowercase regex match. TLD / Extension joins every label after the first dot. Syntax Status shows Valid RFC or Invalid Syntax according to the local label pattern.
FAQs related to that specific tool
How many lines can I submit?
The bulk interface allows up to ten non-empty lines.
Why is the button disabled?
A correct answer to the displayed math CAPTCHA is required.
Are duplicate domains removed?
Yes. Extracted matches are lowercased and deduplicated.
Does Valid RFC mean the domain exists?
No. DNS and registration are not checked.
Are Unicode domains validated?
No. The extraction pattern accepts ASCII letters, digits, and hyphens.
Does the check enforce the complete DNS standards?
No. It applies a local regular expression to each extracted match.