Email authentication

abcd.su SPF validation

Cached SPF record analysis for this domain.

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SPF validation

Record found

Valid SPF record

Query name

abcd.su

Terminal all

DNS lookup count

SPF record count

SPF record

v=spf1 include:_spf.mx.cloudflare.net ~all

Mechanisms

+include:_spf.mx.cloudflare.net~all

Recommendations

softfail (~all) is common during rollout; tighten to -all once includes are verifiedpair with DMARC Analyzer and DKIM Validator before tightening mail authentication enforcement

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Same target (abcd.su) — open the next tool without retyping.

Email Auth CheckerSame targetRun SPF, DMARC, and DKIM checks in one auditabcd.suOpen
DMARC AnalyzerSame targetDMARC policy, alignment and reporting checksabcd.suOpen
DKIM ValidatorSame targetDKIM selector lookup and record validationabcd.suOpen
DNS CheckerSame targetAll major record types in one passabcd.suOpen
DIGSame targetOne record type, resolver-style answerabcd.suOpen
Domain IP LookupSame targetA and AAAA IP addresses for a domainabcd.suOpen
Domain Age CheckerSame targetCreation date, age, registrar and expiryabcd.suOpen
WHOISSame targetRegistrar, expiry and domain statusabcd.suOpen
HTTP Header CheckerSame targetResponse headers, redirects and cachingabcd.suOpen
HTTP/2 TesterSame targetHTTP/2 support, ALPN and TLS negotiationabcd.suOpen
SSL Certificate CheckerSame targetCertificate chain, SAN and TLS versionabcd.suOpen
CAA Record CheckerSame targetCheck CAA DNS records, authorized CAs, issuewild and iodefabcd.suOpen
Blacklist CheckerSame targetDNSBL reputation for IP and domainabcd.suOpen
Punycode ConverterSame targetUnicode ↔ Punycode for IDN domainsabcd.suOpen
URL SplitterSame targetBreak a URL into parts and query paramshttps://abcd.su/Open
Base64 CodecEncode and decode Base64 textOpen
Password GeneratorStrong random passwords for ops workOpen
Password Strength CheckerEntropy, crack time and password suggestionsOpen
Passphrase GeneratorMemorable random word phrases for safer sharing testsOpen
BIN CheckerCard brand, bank and country from BIN/IINOpen
IP CalculatorSubnet math for IPv4 and IPv6 CIDROpen
Browser Update CheckerBrowser version, update status and Client HintsOpen

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Guides

Practical guides for common SPF Validator tasks — DNS records, troubleshooting steps, and links to our free tools.

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SPF TXT record basics at the domain apex. SPF authorizes mail senders through a single v=spf1 TXT record published at the domain apex, not at _dmarc or DKIM selectors. DN01 returns parsed mechanisms, lookup estimates, warnings, and a shareable result URL for the same domain after DNS changes.
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Terminal all qualifiers: pass, fail, softfail, neutral. SPF authorizes mail senders through a single v=spf1 TXT record published at the domain apex, not at _dmarc or DKIM selectors. DN01 returns parsed mechanisms, lookup estimates, warnings, and a shareable result URL for the same domain after DNS changes.
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SPF alignment with DMARC enforcement. SPF authorizes mail senders through a single v=spf1 TXT record published at the domain apex, not at _dmarc or DKIM selectors. DN01 returns parsed mechanisms, lookup estimates, warnings, and a shareable result URL for the same domain after DNS changes.
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Shareable SPF validator result pages. SPF authorizes mail senders through a single v=spf1 TXT record published at the domain apex, not at _dmarc or DKIM selectors. DN01 returns parsed mechanisms, lookup estimates, warnings, and a shareable result URL for the same domain after DNS changes.
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Related articles

SPF TXT record basics at the domain apex

Include mechanisms and third-party senders

Terminal all qualifiers: pass, fail, softfail, neutral

SPF DNS lookup limit and flattening

SPF alignment with DMARC enforcement

Shareable SPF validator result pages