Domain Basics

Understand domain names, root, TLD, second-level domains, subdomains, registration boundaries, and the difference between a domain and a URL.

Configure ddclient for changing IPv4 addresses, protect update credentials, and check DNS separately from network reachability.

Diagnose DNS_PROBE_FINISHED_NXDOMAIN by checking the exact name, browser lookup path, resolver responses, authoritative records, and negative caches.

Clear the right DNS cache, compare results, and distinguish local stale answers from upstream caching, missing records, and browser problems.

Learn what AAAA records do, when to publish IPv6 addresses, and how to diagnose a site that works over IPv4 but fails over IPv6.

Measure DNS lookup speed and reliability on your own network, then test the game separately before keeping a resolver change.

Clean a bulk domain list, respect API limits, recover from rate limits, preserve unknown results, and recheck prices before buying.

Move authoritative DNS with a complete record inventory, a DNSSEC migration plan, and checks for website and email continuity.

Check domain age with registration data, then separate website history, ownership changes, and evidence gaps before trusting an age claim.

Choose a domain registrar by comparing renewal costs, account security, DNS freedom, recovery support, and transfer terms before checkout.

Choose A or CNAME records for a website, understand apex restrictions and flattening, and check DNS separately from HTTPS redirects.

Connect an apex domain or subdomain to GitHub Pages, verify domain control, check DNS records, and resolve HTTPS failures.

Separate DHCP leases, DNS resolver settings, authoritative records, and dynamic updates before troubleshooting a network connection.

Choose DNS records by their job, trace website and email dependencies, and verify changes without breaking unrelated services.

Enable and maintain DNSSEC with clear responsibility for signing, parent DS records, provider migrations, and recovery.

Choose 301, 302, 307, or 308 redirects, preserve the right URLs, and check HTTPS before forwarding a domain.

Compare free business email with or without a domain. Check Zoho eligibility, forwarding limits, paid renewals, and sending before choosing.

Compare free subdomains and first-year domain offers. Check eligibility, renewals, account control, cancellation, and transfer options before signing up.

Understand FQDNs, trailing dots, DNS search lists, and zone-file origins, then test the exact name without changing your records.

Use ICANN Lookup to identify a registrar, read registration dates and status codes, and separate public records from ownership and availability claims.

Find IPv6 DNS server addresses and test IPv4 and IPv6 resolver paths without confusing query transport, AAAA records, and website connections.

Compare ISP DNS with a public resolver through local tests, privacy policies, filtering requirements, and a reversible change on one device.

Use explicit nslookup servers and record types to compare resolver answers, check authoritative data, and distinguish DNS errors.

Learn how primary and secondary DNS servers replicate zones, handle failures, and differ from preferred and alternate resolvers.

Register a domain with a practical checklist for eligibility, checkout, contact verification, DNS, website setup, and email.

Renew your domain name, verify the new expiry date, check auto-renew and payment settings, and contact your registrar quickly after expiration.

Learn who controls reverse DNS, how to check PTR and forward records, and why matching records do not replace email authentication.

Learn how root DNS servers provide referrals, why 13 names represent many instances, and how caching and DNSSEC change the lookup path.

Plan a private DNS resolver with Unbound, distinguish recursion from forwarding and dynamic DNS, and test access controls before a network rollout.

Set up email on your domain by choosing an email host, verifying ownership, adding the required DNS records, and testing sending and receiving.

Understand www, blog, app, and other subdomains, then plan DNS records, hosting, certificates, and service ownership before adding a hostname.

Publish SPF, DKIM, and service verification TXT records at the right names, preserve existing consumers, and test each change.

Understand the RDAP transition, public registration fields, redaction notices, and the limits of owner searches before interpreting a domain record.

Learn what wildcard DNS matches, how existing names stop matches, and why DNS, TLS certificates, and website routing need separate checks.

Understand the difference between a domain name and web hosting, what each provides, and how to connect them when using different providers.

Compare subdomains and subdirectories for content, apps, and international sites, with practical management tradeoffs and Google's stated SEO guidance.

Plan a registrar transfer, check eligibility and locks, obtain the required authorization, and verify website and email continuity after the move.

Explore brandable domain name examples and the naming qualities behind them, from pronunciation and memorability to flexibility and fit.

A practical, research-backed guide for founders naming a project, product, or company: clear it legally, make it easy to say, generate strong candidates, check it across cultures, and run the searches that matter before you commit.

A plain-English guide to escrow and domain escrow — what an escrow account is, how escrow works step by step in a domain sale, why it matters for avoiding fraud, traditional escrow services vs. the modern tokenized approach, and how smart contracts can replace escrow with atomic on-chain settlement.

UDRP explained for domain owners and investors: the three elements a complainant must prove, the process and timeline, outcomes, UDRP vs URS vs court, and how to respond.

Learn domain terminology, including domain names, URLs, hostnames and the domain name space, plus essential domain investing terms.