DNS Zone Linter

Normalize and canonicalize BIND zone files with error checking and formatting

Normalization: Sort records, remove duplicates, and apply consistent formatting.

Error Detection: Identify syntax errors, missing records, and configuration issues.

Canonicalization: Apply standard ordering and TTL defaults for clean output.

Zone File Examples

Zone File Content

Zone File Format

BIND zone files define DNS records for a domain. They include resource records (RRs) with owner names, TTL values, classes, types, and data. Proper formatting ensures reliable DNS operation.

Normalization Benefits

Normalizing zone files improves readability, reduces errors, and ensures consistent formatting. It also helps identify duplicate records and missing essential records like SOA and NS.

Common Issues

Watch for missing trailing dots in FQDNs, duplicate records, incorrect TTL values, and missing SOA or NS records. The linter helps catch these configuration problems early.

Best Practices

Use consistent TTL values, maintain proper record ordering, include comprehensive NS records, and regularly validate your zones. Consider using shorter TTLs during transitions.