Articles & Guides
Useful resources for web developers and system administrators
Found 44 · DNS · Reset
DNS
nslookup Command: How to Use It and Read the Output
How to use nslookup on Windows, Linux and macOS: query a specific DNS server, look up MX, TXT, NS and SOA records, read the output and fix common errors.
DNS
DNS Server Not Responding: How to Fix It on Windows and More
DNS server not responding? Find the cause by symptom and fix it: router reboot, flushdns, Winsock reset, public DNS like 1.1.1.1, nslookup tests, macOS and Linux.
DNS
Cloudflare DNS 1.1.1.1: All Addresses, Setup and Why It Fails
Cloudflare DNS 1.1.1.1 explained: the alternate 1.0.0.1 and filtered pairs, DoT hostname and DoH URL, setup on every device, and why 1.1.1.1 gets blocked.
DNS
AdGuard DNS: Addresses, Setup and What It Actually Blocks
AdGuard DNS addresses for all three modes, setup on a router, Windows, macOS and Android, plus DoH, DoT and DoQ. What a DNS filter blocks and what it never can.
DNS
Quad9 DNS 9.9.9.9: What It Is, Setup and How It Compares
Quad9 (9.9.9.9) is a public DNS resolver that blocks malicious domains. The .9, .10 and .11 address sets explained, router and system setup, DoH and DoT, versus 1.1.1.1.
DNS
Ghost Domain: Why a Removed Delegation Still Resolves
A resolver learns your nameservers from two places, and the second one can refresh itself forever. That is why a nameserver migration can outlive its own TTL.
DNS
Resolvers Return Different IPs: Propagation and Stale Cache
Two resolvers, two answers for one hostname. Four causes, only one fixes itself. Query each authoritative nameserver and tell propagation from a real defect.
DNS
What Is DNS: How It Works and Why You Need It, Explained
What is DNS and how it works: the full path of a lookup, resolver roles, caching and TTL, private DNS over TLS and HTTPS, plus how to check records with dig.
DNS
How to configure DNS: Windows, router, Android and server
How to configure DNS: change the DNS server on Windows 10 and 11, macOS, Android and your router, set domain A, CNAME, MX and NS records, then verify the result.
DNS
How to Change DNS Server: Windows, macOS, Linux, Android
How to change the DNS server on Windows 10 and 11, macOS, Linux, Android, iOS and your router: step-by-step paths, PowerShell and resolvectl commands, verification.