๐Ÿ” DNS Resolution

โ„น๏ธ
DNS over HTTPS: This tool uses secure DNS over HTTPS providers (Cloudflare, Google) since browsers cannot perform direct DNS lookups for security reasons.

๐Ÿงช Example Hostnames:

๐Ÿ’ก DNS Knowledge

๐Ÿ” DNS Resolution

Domain Name System translates human-readable hostnames into IP addresses that computers use to communicate.

๐Ÿ“ Record Types

A records point to IPv4 addresses, AAAA records point to IPv6 addresses, and other types serve different purposes.

๐ŸŒ DNS Hierarchy

DNS uses a hierarchical system with root servers, TLD servers, and authoritative servers to resolve queries.

โšก DNS Caching

DNS responses are cached at multiple levels (browser, OS, ISP) to improve performance and reduce load.

๐Ÿ”’ DNS Security

DNSSEC provides cryptographic verification, and DNS over HTTPS (DoH) encrypts DNS queries for privacy.

๐Ÿš€ Performance

DNS resolution is critical for web performance. Faster DNS responses mean faster website loading times.

๐Ÿ› ๏ธ Technical Information

๐Ÿ”ง How It Works

  • DNS over HTTPS: Uses encrypted DNS queries via HTTPS APIs
  • Multiple Providers: Tries Cloudflare, Google, and 1.1.1.1 for reliability
  • Record Types: Queries both A (IPv4) and AAAA (IPv6) records
  • Timeout: 5-second timeout per DNS provider

๐Ÿ“Š DNS Record Types

  • A Record: Maps hostname to IPv4 address (32-bit)
  • AAAA Record: Maps hostname to IPv6 address (128-bit)
  • CNAME: Canonical name record (alias to another domain)
  • MX: Mail exchange server records
  • NS: Name server records
  • TXT: Text records for various purposes

โš ๏ธ Limitations

  • Browser security prevents direct DNS system calls
  • Results depend on DNS over HTTPS provider availability
  • Some corporate firewalls may block DoH requests
  • May not show all DNS records that dig/nslookup would
  • Local DNS cache and network settings not reflected

๐Ÿ”’ Privacy & Security

  • DoH Encryption: DNS queries are encrypted in transit
  • No Logging: Reputable providers don't log query details
  • DNS Filtering: Some providers offer malware protection
  • DNSSEC: Cryptographic validation of DNS responses