How we saved 100 terabytes of memory by optimizing 1.1.1.1’s DNS cache
Five Rust-level memory optimizations to the DNS cache layout of Big Pineapple cut per-entry memory by 56%, freeing approximately 100 TB of memory across Cloudflare's fleet.
dns
DNS Record Types Explained: A, AAAA, CNAME, MX, TXT, and More
DNS record types map domains to servers, route email, publish verification data, and control certificate issuance. See zone-file examples and dig queries.
DNS record cards linking a domain to IP addresses, mail servers, and security policies
MX records route email
We’re making Bunny DNS free
Your DNS bill shouldn't scale with your traffic. So we removed query fees from Bunny DNS entirely. No per-request billing and no query limits.
dig Cheatsheet
Quick reference for querying DNS records, tracing resolution, and debugging name resolution with dig
Whois command in linux
The whois command looks up domain registration, registrar, name server, expiry, IP allocation, and AS number details from Linux.
nslookup Cheatsheet
Quick reference for querying DNS records and checking name resolution with nslookup
What caused the large AWS outage?
On Monday, a major AWS outage hit thousands of sites & apps, and even a Premier League soccer game. An overview of what caused this high-profile, global outage
New talk: Making Hard Things Easy
Making a DNS query in Ruby from scratch
Useful utilities and toys over DNS
Free and useful services over DNS accessible on command line
Some ways DNS can break
An Introduction to DNS Terminology, Components, and Concepts | DigitalOcean
DNS, or the Domain Name System, is an integral part of how the internet functions today. However, the way that DNS works is often quite mysterious for new a…
New tool: Mess with DNS!
What is a Domain Name? - Learn web development | MDN
Domain names are a key part of the Internet infrastructure. They provide a human-readable address for any web server available on the Internet.
DNS doesn't "propagate"
Learn Enough Custom Domains to Be Dangerous | Learn Enough to Be Dangerous
Custom domains for websites, web apps, and email
WHOIS Lookup - Domain Lookup and Availability Checker | Domain.com
Use our WHOIS lookup tool to search available domain names or current domain owners. Start your search today!
DNS 101: An introduction to Domain Name Servers
Domain names provide the internet much more user-friendly way of referencing servers, but have you ever wondered how it works under the covers?
Cloudflare Registrar: what happens when you register a domain?
Every website, large or small, started with an idea, rapidly followed by registering a domain. Most registrars offer promotions for your initial domain registration and then quietly hike the price with each renewal.
Certificates for localhost
Sometimes people want to get a certificate for the hostname “localhost”, either for use in local development, or for distribution with a native application that needs to communicate with a web application. Let’s Encrypt can’t provide certificates for…
Linux / UNIX: DNS Lookup Command
Explains how to use host or dig command to query DNS name servers, dns lookup under UNIX or Linux for troubleshooting purpose.