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SPF Flattening (Pro)

Pro: turn include chains into ip4/ip6 (does not write DNS).

Pro: turn SPF include/a/mx chains into ip4/ip6 lists. Does not write DNS; counts the 10-lookup rule.

Queries leave from this Linux server, not your ISP DNS. Free. Cached answers can differ for a short time.

Today 0 / 40 queries

Flattening output

Calculator only. TXT length and lookup overruns matter.

Field Meaning Watch
Lookups DNS query count ≤10 target
ips ip4:/ip6: list Unique
record Flat v=spf1 … 255+ char warning

SPF Flattening (Pro)

Simulates collapsing includes to fixed IPs so lookup limits are not breached. Not managed DNS; you paste the result into your panel.

Google/Microsoft includes change often; refresh flatten periodically. Guests get 403 upgrade_required.

Examples

Prefix
flatten:example.comSuper box.
Next
SPF CheckerValidate before publish.

Frequently asked questions

Why Pro?

Chain resolution adds DNS load and compute; tied to membership quota.

Auto-updated?

No. You re-run and update the TXT yourself.

Prefix?

Type flatten:example.com in the super box.

Does it write DNS?

No. Calculator only; you publish in your panel.

Lookup overrun?

The tool counts and warns. Over 10 risks permerror.