How to Fix "DNS Server Not Responding" and DNS_PROBE Errors
Step-by-step fixes for "DNS server is not responding," "can't reach this page," and DNS_PROBE_FINISHED_NO_INTERNET errors on any device or browser.
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Network guides & practical tutorials
Deep dives on IP lookup, DNS, VPN privacy, subnetting, and troubleshooting - written for admins, developers, and curious users.
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How to Change Your DNS Server (and the Best DNS for Gaming and PS5)
How to change your DNS on Windows, Mac, iPhone, and your router, plus which DNS servers are actually fastest for gaming and PS5. 1.1.1.1 vs 8.8.8.8 compared.
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How to Flush DNS on Windows, Mac, Linux, and Chrome
Step-by-step commands to flush your DNS cache on Windows, macOS, Linux, and in Chrome. Fix sites that won't load or still show the old server.
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How to Check If Your Router's IP Is Public or Private
Your router has both a private LAN IP and a separate WAN IP. Here's exactly where to find each on a TP-Link (or any) router, and how to tell if the WAN IP is public or private.
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What Is CGNAT and Why Your Public IP Might Not Be Yours Alone
CGNAT lets ISPs share one public IP across many customers, which explains port forwarding failures and unexpected flagging. Here's how to spot it and what to do about it.
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Private IP Address Ranges Explained (10.x, 172.16.x, 192.168.x)
A breakdown of the three private IP address ranges (10.x, 172.16.x, 192.168.x), how IP classes relate to them, and how to tell if a specific address, like 30.0.0.0/8, falls inside one.
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Public vs Private IP Addresses: What's the Difference and How to Tell
How to check if an IP is public or private using the number ranges directly or an instant checker, including the CGNAT and loopback cases people usually miss.
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Someone Sent You an IP Address: Here's How to Check What It Means
Got handed an IP address and not sure what to do with it? Here's a step-by-step walkthrough for checking what it actually tells you, and what it doesn't.
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IPv4 vs IPv6: What's the Difference and Which One Am I Using?
IPv4 and IPv6 explained in plain terms, including how to tell which one your device is using and why you might see both at once.
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Why Does "What Is My IP" Show a Different Answer on Different Sites?
If two IP checkers give you different results, here's why that happens and how to tell which one is actually accurate.
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