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DNS explained for home internet users

DNS is often described as the internet's phone book. That is useful shorthand: it helps applications find network information associated with names such as websites.

DNSResolverRFC 1034

Last reviewed: August 10, 2026 · By Evan R. Haldane

Name to answer

Your device normally sends DNS questions to a recursive resolver, which can obtain or cache answers from the DNS hierarchy. The classic DNS architecture is defined by RFC 1034 and RFC 1035, with many later updates.

Caching

Resolvers and clients cache answers for specified periods. Caching reduces repeated lookups and load but also means changes are not necessarily visible everywhere immediately.

Resolver choice

Your ISP, router, operating system or encrypted-DNS configuration may determine which resolver is used. Changing resolvers can affect lookup behavior, privacy policy and filtering, but it cannot add missing Wi‑Fi signal or repair a congested access line.

DNS failure vs internet failure

If direct network connectivity exists but names do not resolve, DNS may be involved. If the router has lost its upstream connection entirely, changing DNS settings will not restore the physical service.

Networking capabilities vary by hardware, firmware, ISP, country and radio environment. Settings names differ among manufacturers, so use your device's current documentation for product-specific changes.