IP Address, Privacy & Network Guides
Clear explanations of IP addresses, internet privacy, VPNs, DNS, location, and common network issues.
IP Address Basics
What Is an IP Address?Understand the address websites use to reach your connection.Public vs Private IP AddressLearn the difference between local and internet-routable addresses.Static vs Dynamic IP AddressSee why an address may stay the same or change.IPv4 vs IPv6Compare the two address systems used on today's internet.What Does Your IP Address Reveal?Understand approximate location and network information.What Browser Information RevealsUnderstand user agents, platform, language, viewport, and their limits.
Networks, ASN & Subnetting
What Is an ASN?Understand autonomous systems, routed prefixes, and network operators.What Is CIDR?Learn how prefixes describe IP address blocks and ranges.What Is Subnetting?Understand subnet masks, network boundaries, and traditional host ranges.WHOIS vs RDAPUnderstand structured registration data and its interpretation limits.
DNS & Domain Names
What Is DNS?Understand DNS records, resolvers, and authoritative nameservers.DNS Propagation ExplainedUnderstand resolver caching and DNS change timing.What Is Reverse DNS?Learn how PTR records associate IP addresses with hostnames.Why Is My DNS Not Updating?Troubleshoot cached, delegated, and inconsistent DNS changes.Using DNS over HTTPS for TroubleshootingUnderstand when encrypted DNS can help and its practical limits.
Email & Domain Authentication
MX Records ExplainedLearn how mail exchanger priorities work.SPF Records ExplainedUnderstand SPF syntax and its limits.What Is DKIM?Understand signatures, selectors, DNS keys, and verification results.DMARC ExplainedLearn monitoring, quarantine, reject, and alignment.How to Read Email HeadersInterpret routing, identity fields, and reported authentication results.SPF ~all vs -allCompare SPF softfail and hardfail policies safely.Why Does SPF Fail?Investigate common SPF policy failures.DMARC p=none vs quarantine vs rejectUnderstand staged DMARC policy enforcement.Why Does DMARC Fail?Diagnose alignment and policy issues.
Web & Server Diagnostics
HTTP Headers ExplainedUnderstand redirects, caching, and security headers.HTTP Security Headers ExplainedUnderstand browser security policies including CSP and HSTS.SSL Certificates ExplainedUnderstand certificate names, expiry, and TLS context.SSL Certificate Name MismatchFix a certificate that does not cover the requested hostname.SSL Certificate ExpiredTroubleshoot renewal and deployment problems.301 vs 302 vs 307 vs 308Choose and inspect HTTP redirect behavior.Why Is My Website Redirecting Unexpectedly?Trace redirect loops and conflicting rules.Open vs Closed vs Timed-Out PortsInterpret TCP reachability results correctly.Ping and Latency ExplainedUnderstand TCP response time, delay, timeouts, and measurement limits.
Privacy, VPNs & Proxies
How to Hide Your IP AddressUnderstand VPNs, proxies, and their limits.Does a VPN Hide Your IP Address?Check what a VPN changes and what it does not.How to Check Whether Your VPN Is WorkingUse a practical before-and-after connection check.Why Is My VPN Not Changing My IP?Troubleshoot a VPN that is not routing expected traffic.What Is a DNS Leak?Learn what DNS routing can reveal.What Is a WebRTC Leak?Understand browser connection candidates and privacy protections.What Is an IPv6 Leak?See why IPv6 routing can matter with a VPN.What Is a Proxy Server?Learn how proxy servers work and how they differ from VPNs.How to Change Your IP AddressExplore legitimate ways a public IP address can change.How to Compare VPN ServicesUse practical criteria instead of a brand ranking.Set Up a Proxy With a BrowserUnderstand browser and operating-system proxy settings.
Troubleshooting & How-To
Why Is My IP Location Wrong?Learn why IP geolocation is only an estimate.Why Does Google Think I Am in Another Location?Understand how IP, account, and device signals can differ.Why Does My IP Address Keep Changing?Explore common causes of address changes.Why Is My IP Address Blacklisted?Understand reputation lists and practical remediation.How to Find Your IP Address on WindowsFind local and public IP information on Windows.How to Find Your IP Address on iPhone or AndroidFind the right address for your mobile connection.