DNS & Email Authentication Tools
DNS record resolution, mail authentication, SPF, DMARC and selectors observed through server DNS.
Tools in this collection
A Record CheckerResolve public IPv4 address records and see their observed DNS TTLs.Use tool →AAAA Record CheckerLook up IPv6 addresses advertised in DNS and their TTLs.Use tool →MX Record CheckerInspect mail-server exchange hosts and delivery priorities.Use tool →NS Record CheckerIdentify authoritative nameservers returned by the resolver.Use tool →TXT Record CheckerInspect published DNS TXT policy and verification records.Use tool →CNAME LookupCheck aliases and their canonical target hostnames.Use tool →SOA Record CheckerInspect the zone authority, serial and refresh values.Use tool →CAA Record CheckerCheck published certificate-authority authorization rules.Use tool →SRV Record CheckerResolve service discovery targets, priorities and ports.Use tool →DNSSEC Record CheckerInspect DNSKEY and DS availability; local DNSSEC validation is not proven.Use tool →SPF Record AnalyzerFind published SPF TXT policies and flag multiple policies or obvious errors.Use tool →DMARC Record AnalyzerInspect published DMARC policy at _dmarc for syntax and reporting tags.Use tool →DKIM Selector LookupResolve a DKIM selector at selector._domainkey.domain supplied as selector@domain.Use tool →Email Domain Security CheckCombine observed MX, SPF, DMARC and DNSSEC-related records.Use tool →All DNS Records LookupFetch supported public A, AAAA, CNAME, MX, NS, TXT, SOA and CAA types.Use tool →SPF Include AnalyzerCount SPF include/redirect mechanisms to flag possible DNS-lookup-limit risk.Use tool →DMARC Policy ExplainedExplain observed p, sp, pct and reporting fields from the domain DMARC record.Use tool →MX Priority AnalyzerSort observed mail exchanges and identify duplicate preference values.Use tool →
How to choose a tool
Start with the task you can validate from real public responses or source data. Use the relevant primary evidence and then compare related checks. These tools do not invent live keyword rankings, backlink counts, AI citations, or search volume.