DNS and BIND Zone File Guides
Practical references for writing, validating, and troubleshooting BIND master files
These guides focus on the parts of DNS zone files that named-checkzone can validate and the operational details that often cause mistakes during DNS changes. Use them alongside the validator when preparing a zone file for BIND9.
How to Write a BIND Zone File
Zone file structure, common directives, and examples for SOA, NS, A, AAAA, CNAME, MX, TXT, SRV, and PTR records.
Common BIND Zone File Errors
Frequent validation errors, why BIND reports them, and the safest fixes.
named-checkzone Explained
What the BIND validation utility checks, how to run it locally, and how to interpret the output.
SOA Record Explained
Every SOA field explained, including serial numbers, refresh timing, retry timing, expiry, and negative caching.
DNS TTL Guide
How TTL values work in BIND zone files and how to plan TTLs before migrations or record changes.
DNS Record Types
A practical reference for the record types most often used in BIND zones and what each one is for.
Email DNS Records
MX, SPF, DKIM, DMARC, MTA-STS, and TLS reporting records written in BIND zone file syntax.
BIND Zone File Examples
Validated example zones using reserved domains and addresses you can adapt for your own records.
BIND Validation Checklist
A pre-change checklist for reviewing zone files before publishing DNS updates.
Suggested Reading Order
- Start with How to Write a BIND Zone File if you are new to BIND master file syntax.
- Use named-checkzone Explained to understand what the validator can and cannot prove.
- Check Common BIND Zone File Errors when a validation message is unclear.
- Use the validation checklist before changing production DNS.
Ready to test a zone? Paste it into the validator and compare the output with these references.
Open the Validator