DNS Zone File Converter & Validator

Why Use This DNS Zone Converter?

About DNS Zone File Converter & Validator

What is a DNS Zone File?

A DNS zone file is a text file that contains mappings between domain names and IP addresses, along with other DNS records. It follows the BIND (Berkeley Internet Name Domain) format and is used by DNS servers to resolve domain names to their corresponding resources.

Key Features of This Tool

• RFC 1034/1035 Compliance Validation: Automatically checks your DNS records against RFC standards to ensure proper DNS configuration
• CNAME Conflict Detection & Auto-Fix: Identifies CNAME records that conflict with other record types and automatically resolves them
• Multi-Format Support: Seamlessly converts between Cloudflare exports, F5 DNS formats, and standard BIND zone files
• 100% Client-Side Processing: All conversions happen in your browser - your DNS data never leaves your device, ensuring complete privacy
• Intelligent Auto-Fix: Automatically fixes common issues like improper TXT record quoting and DNS conflicts
• Comprehensive TTL Validation: Checks Time-To-Live values and provides best practice recommendations
• Multiple Export Options: Download as .zone file or .zip archive for easy import into any DNS system
• Real-time Validation: Instant feedback on errors, warnings, and auto-fixed issues with detailed explanations

Supported DNS Record Types

This tool validates and converts all standard DNS record types:

• SOA (Start of Authority): Defines authoritative information about the DNS zone including primary nameserver and zone serial number
• NS (Name Server): Specifies authoritative name servers for the domain
• A (Address): Maps domain names to IPv4 addresses
• AAAA: Maps domain names to IPv6 addresses
• CNAME (Canonical Name): Creates aliases from one domain name to another
• MX (Mail Exchange): Specifies mail servers for the domain with priority values
• TXT (Text): Holds text information, commonly used for SPF, DKIM, DMARC, and domain verification
• SRV (Service): Defines location of services like VoIP or instant messaging
• CAA (Certification Authority Authorization): Specifies which certificate authorities can issue SSL certificates for your domain

Common DNS Zone File Issues Detected

This validator automatically detects and fixes these common problems:

• CNAME Conflicts (RFC 1034 Violation): CNAME records cannot coexist with other record types at the same name. The tool automatically removes conflicting CNAMEs.
• Invalid TTL Values: TTL must be between 0 and 2,147,483,647 seconds. Very low TTLs (<60s) trigger warnings with recommendations.
• Missing or Multiple SOA Records: Every zone must have exactly one SOA record at the apex
• Insufficient Name Servers: RFC 1034 recommends at least 2 NS records for redundancy and failover
• Improper TXT Record Quoting: TXT records must be enclosed in double quotes per RFC 1035 - automatically fixed
• Invalid MX Format: MX records must include priority value and hostname in correct format
• Localhost in Production: Detects 127.0.0.1 addresses in non-localhost records which are typically configuration errors

Primary Use Cases

• DNS Provider Migration: Convert zone files when migrating between Cloudflare, AWS Route53, F5 Distributed Cloud, Google Cloud DNS, or other providers
• Zone File Validation: Validate zone files before importing into production DNS servers to prevent service disruptions
• Format Conversion: Convert proprietary DNS exports to standard BIND format for universal compatibility
• DNS Audit & Compliance: Audit DNS configurations for RFC compliance and identify potential issues
• Troubleshooting Import Errors: Identify and fix issues causing zone file import failures in DNS management systems
• Learning & Training: Understand DNS zone file syntax, RFC requirements, and best practices
• Automation & CI/CD: Integrate DNS validation into deployment pipelines for infrastructure-as-code

How to Use This Tool

Step 1: Upload or paste your DNS zone file. The tool supports Cloudflare exports, F5 DNS configurations, and standard BIND zone files.

Step 2: Enter your domain name and click "Convert & Validate". The tool will automatically detect your input format and validate all records.

Step 3: Review validation results. Click on statistics to filter by errors, warnings, or auto-fixed issues. Each issue includes detailed explanations and RFC references.

Step 4: Download your converted zone file as a .zone file for direct use, or as a .zip archive for import into systems like F5 DNS that require compressed files.

Security & Privacy Guarantee

Your DNS configuration is sensitive infrastructure data. This tool is built with privacy as the top priority:

• 100% Client-Side Processing: All parsing, validation, and conversion happens in your browser using JavaScript
• Zero Server Communication: Your zone files are never uploaded to any server. No data transmission occurs.
• No Data Collection: We don't collect, log, or store your domain names, DNS records, or any personal information
• Open & Transparent: Inspect the source code - all operations are visible in your browser's developer tools
• Works Offline: Once the page loads, you can disconnect from the internet and continue using the tool

Technical Implementation

Built with vanilla JavaScript for maximum compatibility and performance. Implements RFC 1034 and RFC 1035 specifications for DNS. Supports BIND 9+ zone file format with full backwards compatibility. Parses complex DNS records including multi-line SOA records, quoted TXT strings, and wildcard entries. Uses Web Crypto API for secure file handling and Blob API for client-side downloads.

Compatible DNS Systems

The converted zone files work with all major DNS providers and systems including:

• F5 Distributed Cloud DNS (requires .zip format)
• Cloudflare DNS
• AWS Route 53
• Google Cloud DNS
• Microsoft Azure DNS
• BIND (Berkeley Internet Name Domain)
• PowerDNS
• NSD (Name Server Daemon)
• Knot DNS
• Any RFC-compliant DNS server

RFC Compliance Standards

This tool validates against official DNS standards:

• RFC 1034: Domain Names - Concepts and Facilities
• RFC 1035: Domain Names - Implementation and Specification
• RFC 2181: Clarifications to the DNS Specification
• RFC 4034: Resource Records for DNS Security Extensions

Frequently Asked Questions

Q: Is this tool free to use?
Yes, completely free with no registration, limits, or hidden fees.

Q: Can I use this for large zone files?
Yes, the tool handles zone files of any size. Performance depends on your browser, but most zone files process in under a second.

Q: Will auto-fix change my DNS records?
Auto-fix only resolves RFC violations like CNAME conflicts and improper quoting. It never modifies IP addresses, hostnames, or record data. You can review all changes before downloading.

Q: What happens to conflicting CNAME records?
When a CNAME conflicts with A, AAAA, MX, TXT, or NS records at the same name, the tool removes the CNAME and keeps the other records, as required by RFC 1034.

Q: Can I trust this tool with sensitive DNS data?
Absolutely. All processing happens in your browser. No data is sent to any server. You can verify this by checking your browser's Network tab in Developer Tools.