IIPP.COM LEARN

Domain & IP Learning Center

Clear, practical guides for WHOIS, RDAP, DNS, IP networks and website diagnostics.

Each guide links to a live lookup tool, so you can check real DNS and registration data as you read.

DNS & Domain Operations

4 guides

A practical, step-by-step workflow for finding out whether a website problem comes from DNS, HTTPS or the origin server.

A practical reference for the DNS records used by websites, email, verification, delegation and certificate issuance.

Understand recursive caching, negative answers, resolver differences and a safe TTL workflow for DNS changes and migrations.

Understand which service answers domain ownership, registry and current DNS questions, and why their results can legitimately differ.

4 guides

A systematic way to diagnose a website that times out, shows an error page or opens only for some visitors.

Understand what common 5xx responses mean and how to trace a failure through a proxy, web server and application.

Learn how to diagnose certificate mismatches, SNI and HTTP-to-HTTPS redirects across root domains, www hostnames, proxies and origin servers.

Find out why a site works over IPv4 but fails for IPv6 users, and how to check AAAA records, routing, firewalls, TLS and CDN settings.

2 guides

Learn how three DNS-based email authentication mechanisms work together and how to investigate messages that fail authentication or land in spam.

Plan a domain or hosting move with TTL preparation, A and AAAA checks, mail continuity, HTTPS verification and a rollback path.

1 guides

Understand network ranges, autonomous systems, providers, reverse DNS and approximate geolocation without over-interpreting public IP data.