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Domainer - Extract Root Domains from a List of Domains

Domainer is a Go script that extracts the root domain from a list of domains based on a provided list of top-level domains (TLDs) that follows the rules of ARPANET host names as specified in RFC1034 and RFC1123. The list of Top-Level Domains is based on the official TLD list. Also it respects so called Country Code Top-Level Domains.

Installation

To install Domainer, you can use the following command:

go install github.com/topscoder/domainer@latest

This will install the Domainer script as an executable in your Go bin directory.

Usage

To use Domainer, provide a list of domains via stdin (standard input). The script will extract the root domain for each domain and print the results to stdout (standard output).

Example Usage:

cat domains.txt | domainer

The domains should be provided as separate lines in the domains.txt file.

TLDs

Domainer uses an internal list of TLDs, so there is no need for the end user to provide a separate TLDs file. The internal list includes a comprehensive set of TLDs, including both generic TLDs (gTLDs) and country code TLDs (ccTLDs).

Notes

  • The script follows the rules for ARPANET host names as specified in RFC1034 and RFC1123.
  • The list of Top-Level Domains is based on the official TLD list.
  • It respects so called Country Code Top-Level Domains, like .co.uk and .com.mx
  • Domainer removes the scheme (if present) from the input domain before extracting the root domain.
  • If a domain doesn't match any of the internal TLDs or if the extracted root domain is determined to be invalid, it will be marked as "none".

License

This project is licensed under the MIT License. See the LICENSE file for more details.

Credits

This script was created by topscoder together with ChatGPT.