DNS (Domain Name System)

The Domain Name System (DNS) translates human-readable domain names like deinkunde.com into the IP addresses computers use to connect.

DNS is the internet's address book. Every request starts with a DNS lookup; if it fails or returns the wrong record, users cannot reach your site even when the server itself is healthy. DNS problems are a common, hard-to-spot cause of outages.

Monitoring DNS records (A, AAAA, MX, TXT, and more) catches misconfigurations, hijacks, and propagation issues before they take you offline.

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Related terms

TTFB (Time To First Byte)Time To First Byte (TTFB) is the time between making a request and receiving the first byte of the response.DNSBL / RBL (Blocklist)A DNSBL (DNS-based Blocklist), also called an RBL, is a published list of IP addresses or domains flagged for sending spam or malicious traffic.SSL/TLS CertificateAn SSL/TLS certificate is a digital credential that enables encrypted HTTPS connections and proves a site owns its domain.

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