Batch
Check a whole list, not one by one.
Paste up to 100 addresses or domains. Each one is resolved against public DNS and mapped to its connection settings. Export the table as CSV or JSON when it's done.
batch · max 100
0 entries
Migrations
Inventory a support inbox or an exported contact list before moving mailboxes.
Lead routing
Segment by provider before a campaign: Workspace tenants are not the same as a regional host.
Debugging
Find the three rows in a spreadsheet that were silently breaking your sender.
Need this in a pipeline? The same resolver is a free JSON endpoint — no key, CORS open, 60 requests a minute.
API reference →