Domain & Hostname Extractor: Extract Top-Level Domains & Subdomains

Published August 5, 2026 · 6 min read read

Extract root domains, subdomains, TLDs, and port numbers from lists of website URLs.

Welcome to this detailed guide on Domain & Hostname Extractor: Extract Top-Level Domains & Subdomains provided by Run It Free. In this article, we explain the key concepts, formulas, practical applications, and step-by-step methods to get the best results.

Key Takeaways

  • Understand the underlying calculations and practical benefits.
  • Learn how to optimize your results using free browser-based tools.
  • Follow simple, step-by-step instructions for maximum privacy and security.