DNS & Network Glossary
Plain-English definitions for DNS, email authentication, SSL, and networking terms — with links to the tools you need to check each one.
DNS TTLHow long DNS records are cache…
SPF RecordAuthorizes servers to send ema…
DKIMCryptographic email signature …
DMARCEmail authentication policy st…
CNAME RecordDNS alias record pointing to a…
MX RecordDNS record directing email to …
NS RecordDNS records identifying author…
A RecordMaps a hostname to an IPv4 add…
AAAA RecordMaps a hostname to an IPv6 add…
SOA RecordContains authoritative info ab…
TXT RecordDNS record storing arbitrary t…
PTR RecordReverse DNS — maps IP to hostn…
DNSBLReal-time DNS blacklist for sp…
SSL/TLSEncryption protocol for secure…
WHOISDomain registration informatio…
CDNDistributed network for faster…
ASNUnique identifier for a networ…
DNS Zone FileText file containing all DNS r…
DoHEncrypted DNS protocol over HT…
DNS PropagationThe process of DNS changes spr…
NameserverServer that stores and serves …