DNS checker

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27/5 2026 New

Feature Update – Security Hardening, Runtime Protection & DNS Export Update

Added

  • Centralized domain normalization pipeline with safer hostname validation
  • IDN/Punycode normalization handling for international domains
  • Recursive SPF traversal protection with recursion ceilings
  • SPF visited-domain tracking to prevent include/redirect loops
  • SPF recursion caching for repeated include resolution
  • Void lookup accounting for SPF exists/include handling
  • Request-scoped DNS query cache with normalized cache keys
  • Maximum in-request DNS cache entry protection
  • DNS query ceilings through centralized safe DNS wrappers
  • WHOIS response size limits and parser line-length protection
  • Subdomain dictionary validation and traversal-safe loading
  • Content Security Policy (CSP) support with Bootstrap CDN compatibility
  • Atomic file write handling for DNS history persistence
  • Concurrency-safe rate limiting using file locking
  • Plaintext DNS export generation for discovered DNS records
  • Direct TXT export downloads from the DNS Records overview panel
  • Clipboard-based DNS export copying with one-click copy functionality
  • Timestamp-based DNS export filenames for improved archival and snapshot tracking
  • Type-aware DNS export formatting for A, MX, TXT, NS and CNAME records
  • AAAA (IPv6) DNS record detection and analysis
  • SRV record discovery and service detection support
  • CAA record analysis for certificate authority restrictions
  • SOA record analysis with DNS zone metadata visibility
  • Expanded DNS export formatting support for AAAA, SRV, CAA and SOA records
  • DNS history and diff tracking support for AAAA, SRV, CAA and SOA records
  • Operational DNS zone intelligence visibility through SOA integration

Improved

  • Improved DNS request orchestration through centralized safe wrapper functions
  • Improved SPF parser resilience against malformed recursion chains
  • Improved cache determinism through normalized DNS host handling
  • Improved WHOIS parser robustness against malformed or oversized responses
  • Improved handling of malformed DNS and WHOIS record structures
  • Improved DNS history integrity during concurrent writes
  • Improved provider detection handling with bounded parser input
  • Improved recursive DNS traversal safety across SPF and DKIM analysis
  • Improved runtime behavior during large scans and recursive lookups
  • Improved defensive validation of dynamically loaded subdomain dictionaries
  • Improved UI accessibility through integrated export utilities directly inside DNS Records overview
  • Improved DNS snapshot diffing and fingerprint tracking for modern DNS record types
  • Improved DNS history visibility for IPv6, service discovery, certificate authority and zone metadata records

This release focuses on major backend hardening, runtime safety, defensive parsing improvements and DNS export functionality across the DNS analysis platform. Significant work has been completed to improve SPF recursion safety, DNS query orchestration, WHOIS parsing robustness, cache behavior, request handling, persistence integrity and DNS export workflows. The platform now includes integrated plaintext DNS exports, clipboard-based DNS copying and timestamped DNS snapshot exports directly from the DNS Records overview interface.