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DNS Record & BIND Zone Generator

Construct RFC 1035 BIND zone files, SOA serials, and multi-cloud DNS records for A, AAAA, CNAME, MX, TXT, NS, and CAA entries.

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📡DNS Record & BIND Zone Generator Documentation & Guide

Web & Developer
The Domain Name System (DNS, RFC 1034 & RFC 1035) maps human-readable hostnames to routable IP addresses and service descriptors across the global Internet. A BIND zone file is the canonical text representation of authoritative DNS data, defining the Start of Authority (SOA), name server delegations (NS), address mappings (A, AAAA), canonical aliases (CNAME), mail routes (MX), and certificate authority authorization policies (CAA).

📋How to Use This Tool

  1. Select a Preset or Domain: Choose a sample scenario (e.g. Modern Apex & Web CDN or Enterprise Mail Exchanger) or input your target root domain.
  2. Set Default TTL: Configure standard Time to Live ($TTL 3600 for production or $TTL 300 for dynamic environments).
  3. Add & Configure Records: Add resource records, selecting the record type (A, AAAA, CNAME, MX, TXT, CAA, NS), hostname, and target value.
  4. Compile & Export: Click 📡 Generate BIND Zone File to produce an RFC 1035 zone file with automatic serial numbering, ready to import into BIND, Cloudflare, AWS Route 53, or PowerDNS.

⚙️RFC 1035 Invariants & The CNAME Apex Restriction

Authoritative DNS engines enforce strict syntactic and structural rules:

• CNAME Apex Invariant (RFC 1912 Section 2.4): A CNAME cannot coexist with any other record on the same node. Because the apex (@) must have SOA and NS records, a CNAME at the root is strictly forbidden by standard DNS (use ALIAS or CNAME flattening).
• SOA Serial Formatting: Recommended standard format is YYYYMMDDnn (e.g. 2026102401), ensuring serial numbers increment monotonically to trigger zone transfers (AXFR/IXFR).
• Fully Qualified Domain Names (FQDN): Hostnames in values ending with a trailing dot (.) are absolute; omitting the trailing dot causes the server to append $ORIGIN.
• CAA Defense: Certificate Authority Authorization (RFC 6844) restricts which CAs can issue SSL certificates for your domain.

💡Practical Use Cases & Best Practices

  • Zero-Downtime Server Migrations: Lower your zone TTL to 300 seconds 48 hours prior to migration so resolver caches expire quickly when pointing to new IP addresses.
  • Dual-Stack IPv4 & IPv6: Always provide paired A and AAAA records for web servers to support modern mobile networks running IPv6-mostly.
  • Lock Down Rogue SSL with CAA: Publish 0 issue "letsencrypt.org" and 0 issuewild ";" to block unauthorized certificate issuance across external subdomains.
100% Client-Side Privacy Guarantee:All zone file compilation, record syntax formatting, and SOA serial generation occur 100% locally in your browser. Zero hostnames, internal IP addresses, or zone records are ever transmitted externally.
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