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DNS Zone Diff

Compare two DNS zone files. Paste your original and modified zones to see exactly which records changed. Runs entirely in your browser.

Zone A (original)
Zone B (modified)

Related Tools

PTR Zone Generator

Generate a BIND-format reverse DNS zone file from a subnet CIDR. Supports standard /8, /16, /24 subnets and classless /25-/31 delegation per RFC 2317.

DNS Lookup

Query any DNS record type for any domain - A, AAAA, MX, TXT, CNAME, NS, SOA, CAA. Results come from Cloudflare's global DNS resolver (1.1.1.1).

DNS Propagation

Check if your DNS changes have propagated globally. Queries 6 public resolvers across Google, Cloudflare, NextDNS, dns.sb, Tiarap, and DNSPod to compare results.

About this tool

When migrating DNS zones between providers or making bulk record changes, a diff makes it easy to verify exactly what changed before and after. Paste the exported zone file from your old provider into Zone A and the new provider's export into Zone B.

Comments (lines starting with ;) and blank lines are ignored. Whitespace is normalized so differences in tab/space formatting don't produce false changes. Results are computed entirely in your browser using a standard LCS algorithm.