Network Utility Suite

Free DNS & Network Tools

A comprehensive collection of free network utilities for system administrators, DevOps engineers, and network professionals. All tools are free, fast, and easy to use.

DNS Flattener

Follow any name's CNAME chain hop by hop to the addresses it ends at, across A, AAAA, CNAME, NS and MX. Perfect for tracking down hosting locations and debugging DNS issues.

  • Resolve CNAME chains to final IPs
  • Show A, AAAA, CNAME, NS and MX records
  • Export results to CSV
  • One-click IP copying

DNS Validator

Validate DNS configuration issues including missing glue records, lame delegation, MX record validation, SPF and TXT record checks, oversized responses, and UDP fragmentation problems.

  • Detect missing glue records
  • Identify lame delegation
  • Validate NS configuration
  • Check MX records (CNAME violations, priorities)
  • Validate TXT records (SPF selection and size)
  • Check for oversized responses
  • Test UDP fragmentation issues

DNS Propagation

Check DNS propagation for six record types across a fixed set of public resolvers worldwide. Compare their answers and identify mismatches.

  • Check all record types (A, AAAA, MX, TXT, NS, CNAME)
  • Query public DNS resolvers worldwide
  • Compare results between resolvers
  • Identify mismatches and anomalies
  • Geographic consistency analysis

DNSSEC Validator

Validate DNSSEC chain of trust, check DS, DNSKEY, and RRSIG records. Verify domain security and signature validity.

  • Chain of trust validation
  • Signature verification
  • Expiry warnings
  • Algorithm detection

Subdomain Lookup

Find subdomains that appear in public Certificate Transparency (CT) logs. The lookup is passive and sends no traffic to the domain you enter.

  • Discover subdomains via CT logs
  • Query public certificate records
  • Searchable results table
  • Export to CSV and JSON
  • Fast, non-intrusive discovery

Why Use Our Network Utilities?

Fast & Reliable

All tools are optimized for speed and reliability, providing results in seconds.

Privacy First

We don't store your queries or personal data. All requests are processed securely and anonymously.

Free Forever

All tools are completely free to use with no hidden costs or premium tiers.