16 guides
Answers with the specifics left in.
Exact settings paths, real commands, real ASN numbers. Each guide opens with the direct answer, then explains why it is the answer.
How to Fix a DNS Leak on Windows 11
Fix a DNS leak on Windows 11 by setting DNS manually on every active adapter under Settings, Network and internet, Wi-Fi, Hardware properties, DNS server assignment, Edit, then disabling smart multi-homed name resolution and flushing the cache with ipconfig /flushdns.
How to Fix a DNS Leak on macOS
On macOS, fix a DNS leak by setting resolvers per network service in System Settings, Network, Wi-Fi, Details, DNS, then flushing with dscacheutil -flushcache and killall -HUP mDNSResponder, and verifying the real resolution order with scutil --dns.
WebRTC Leaks: What They Are and How to Stop Them
A WebRTC leak happens when a web page uses the browser peer-connection API to gather ICE candidates, which can include your real public IP even while a VPN is active. Restrict IP handling per browser to stop it.
What Is an ASN, and What Does Yours Say About You
An Autonomous System Number is a globally unique identifier for a network that controls its own routing policy. Your ASN tells any website which organisation operates the network your traffic came from, which is a stronger signal about you than your IP address alone.
IPv4 vs IPv6: What Changes for You in Practice
IPv6 replaces the 32-bit addresses of IPv4 with 128-bit ones, ending address scarcity and removing the need for NAT. In daily use the differences that matter are VPN leaks, geolocation accuracy, and running both protocols at once.
Why Your IP Location Is Wrong (and How Geolocation Actually Works)
Your IP location is wrong because an IP address contains no geographic information at all. Location is inferred from registry records, routing data, ISP geofeeds and latency measurements, and when that evidence is missing the fallback is a regional centroid.
Why Your VPN Stopped Working With Streaming Services
Streaming platforms block VPNs by classifying the exit address ASN as datacentre space, cross-checking your DNS resolver and device location against the claimed country, and sharing blocklists. An exit stops working when its range gets classified, not when your device changes.
How to Tell If Your VPN Is Actually Leaking
A VPN leaks when any traffic reaches the internet outside the tunnel. Test five things: the IPv4 exit, the IPv6 exit, which resolver answers DNS, what WebRTC gathers, and the default route. Then repeat every test during a reconnect.
CGNAT: Why You Share an IP With Strangers
Carrier-grade NAT lets an ISP put hundreds of customers behind a single public IPv4 address by translating a second time inside its own network. Detect it by comparing your router WAN address against your public address. A WAN address in 100.64.0.0/10 is definitive.
Static vs Dynamic IP: Which One Do You Actually Need
A dynamic IP is assigned by DHCP and can change; a static IP is permanently reserved for you. Most home users need neither, because residential dynamic addresses rarely change and dynamic DNS covers the remaining cases for free.
What Your Browser Headers Reveal About You
Every HTTP request carries headers describing your browser, operating system, language preferences and where you came from. Individually they are unremarkable; combined, they typically identify a browser to within a few thousand others, and Accept-Language is usually the most revealing of them.
TLS Fingerprinting: The Tracking You Can't Turn Off
TLS fingerprinting identifies your client from the structure of its ClientHello message: the cipher list, extensions, curves and version order. It happens before any HTTP data is exchanged, cannot be changed from browser settings, and is why a spoofed User-Agent on curl still gets blocked.
Residential vs Datacenter IPs: Why Sites Treat Them Differently
A residential IP is assigned by a consumer ISP to a household; a datacenter IP belongs to a hosting provider. Sites classify them by ASN, WHOIS records and reverse DNS, and apply far more friction to datacenter ranges.
DNS over HTTPS: Should You Turn It On
DNS over HTTPS encrypts your name lookups so your ISP and local network cannot read or modify them. Turn it on for most personal use, but leave it off where you rely on a local resolver for internal hostnames, network-level content filtering, or security monitoring.
Your IP Got Blacklisted: What Actually Happened
There is no single internet blacklist. Dozens of independent DNS-based blocklists exist, each with its own listing criteria and delisting process, and most consumer-facing blocks come from web reputation systems rather than the email blocklists people usually search for.
Port Forwarding vs VPN: Solving the Right Problem
Port forwarding exposes one service on your network to the entire internet; a VPN extends your private network to a device you control. If only people you trust need access, use a VPN or an overlay network instead.