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