DNS Records

Reference guides to DNS record types — what each record does, the fields it contains, and how to check it.

DNS TXT Record: SPF, DKIM, DMARC & Verification

What a DNS TXT record is, how it powers SPF, DKIM, DMARC and domain verification, the 255-character limit, and how …

What a DNS MX record is, how mail-server priority controls delivery order, why targets must be hostnames not IPs, and …

What a DNS CNAME record is, how it aliases one hostname to another, why it cannot sit at the zone …

What a DNS A record is, how it maps a hostname to an IPv4 address, how it differs from AAAA …

What a DNS NS record is, how it delegates a zone to authoritative name servers, how it differs from the …

What a DNS PTR record is, how reverse DNS maps an IP back to a hostname, why it matters for …

What a DNS AAAA record is, how it maps a hostname to an IPv6 address, how it differs from an …

What a DNS SOA record is, every field it holds (serial, refresh, retry, expire, minimum), and how to read one …

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