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Resolve nested SPF includes into IP ranges. Reduce DNS lookup count, avoid the 10-lookup permerror limit, and keep email deliverability healthy.
SPF flattening recursively resolves all include and redirect mechanisms to their final IP address ranges. The result is a single SPF record with no nested lookups — staying safely under the 10-lookup RFC limit while authorizing the exact same mail servers.
Exceeding 10 DNS lookups causes SPF permerror, which often results in email rejection or spam routing. Flattening prevents this silently.
Adding every vendor's include without counting lookups, forgetting to re-flatten after vendor changes, and not testing before deploying are the top causes of SPF breakage.
Type your domain into the SPF flattener tool above.
We recursively resolve every include and redirect to final IPs.
Compare original vs flattened DNS lookup count.
Copy the flattened record and update your DNS TXT record.
Recursively traces every include and redirect mechanism through the DNS hierarchy to their final destination. No nested lookup is left unresolved.
Accurately counts DNS lookups before and after flattening. Shows exactly how many lookups you save and whether you stay under the 10-lookup limit.
Collates all resolved IP4 and IP6 ranges from every included domain. Eliminates duplicates and sorts for a clean, compact final record.
The flattened record authorizes the exact same mail servers as the original. No legitimate sender is accidentally blocked.
One-click copy of the flattened record. Paste directly into your DNS provider's TXT record editor. No manual formatting needed.
Stays safely under RFC 7208's 10-lookup limit. Eliminates the permerror that silently breaks email delivery for many organizations.
Automate SPF flattening, track lookup-limit trends, and get alerted when new vendors push you toward permerror. Monitor all your domains in one place.