DNS

Domain Name System - Wikiwand
DNS for Rocket Scientists - Contents
A Comparison of DNS Server Types: How To Choose the Right DNS Configuration | DigitalOcean

DNS Checker - DNS Propagation Check & DNS Lookup check DNS propagation status
How to Flush DNS Cache in Microsoft Windows, Linux, and Mac OS

What Happens When Your Domain Expires?
What happens when a domain expires? | Hostinger Help Center domain name lifecycle
The states of domain expiration and redemption – Hover Help Center

RFC 1034 - Domain names - concepts and facilities
RFC 1035 - Domain names - implementation and specification
RFC 2136 - Dynamic Updates in the Domain Name System (DNS UPDATE)
DNS is beautiful - YouTube

An Introduction to Managing DNS | DigitalOcean
Domains and DNS :: DigitalOcean Product Documentation
An Introduction to DNS Terminology, Components, and Concepts | DigitalOcean
What are the differences between Subdomain, Parked Domain and Add-on Domain? | Hostinger Help Center
DNS Concepts - Windows applications | Microsoft Docs
DNS Zones and Records overview - Azure DNS | Microsoft Docs
An Introduction to Learning and Using DNS Records - Tuts+ Code Tutorial
DNS Explained – How Your Browser Finds Websites | Scotch
Anatomy of a Linux DNS Lookup – Part I – zwischenzugs
Anatomy of a Linux DNS Lookup – Part II – zwischenzugs
Hostinger DNS Zone Editor: A Complete Guide for 2021

Get the DNS Migration Checklist: How to migrate DNS for production site for A Record
Minimal downtime for a live site DNS migration - Support / Support Guides - Netlify Support Forums

DNS resolution:
Browser cache
Recursive Name Servers (Name Servers in OS's network setting, /etc/resolv.conf)
Root Name Server
TLD (gTLD, ccTLD)
Authoritative Name Servers (SOA record)
Secondary Name Server (NS record) for second level domains and sub-domains

domain name system - Why does DNS work the way it does? - Server Fault
domain name system - Should we host our own nameservers? - Server Fault
How (and Why) I Run My Own DNS Servers – zwischenzugs

DNS in the cloud: Why and why not | Network World
CloudFlare DNS is simple, fast and flexible
How to Launch a 65Gbps DDoS, and How to Stop One
SAD DNS Explained

Anycast

network#Anycast

Domain Name

Domain name - Wikiwand
New TLDs, five years in - Domain Name Wire | Domain Name News

DNS spoofing/cache poisoning

DNS spoofing - Wikiwand
DNS Cache Poisoning - Computerphile - YouTube

An Illustrated Guide to the Kaminsky DNS Vulnerability
Security Benefits | Public DNS | Google Developers

It's DNS again 😢 Did you know this Malware Hack? - YouTube using DNS TXT record to distribute script

CDN

Cloudflare

Provides free TLS and CDN service

How to manage DNS Zone at Cloudflare | Hostinger Help Center
Managing DNS records in Cloudflare – Cloudflare Help Center

Nameservers

alexa.ns.cloudflare.com
kevin.ns.cloudflare.com

How to Serve a Subdomain as a Subdirectory | CSS-Tricks - CSS-Tricks example.com/blog/ -> blog.example.com

Remote Access: Getting Started with CloudFlare Tunnels (Domains, DNS, Tunnels) - YouTube Zero trust reverse proxy

Price Controls

DNS Records

These are the records stored in Authoritative Name Servers

How to: Edit DNS records (A, AAAA, CNAME, MX, TXT, SRV) – Hover Help Center
CName VS A Record - YouTube
Use CNAME and subdomain to redirect your domain name to an URL
REDIRECT.CENTER
DNS records Types - YouTube
DNS Record Types - CompTIA Network+ N10-007 - 1.8 - YouTube

A
AAAA for IPv6
CNAME
MX
TXT record - Wikiwand
SRV record - Wikiwand

SOA Start of Authority
NS Name Server

Glue Records

Glue record is used to resolve NS record under the same zone to prevent circular dependencies, they are stored in parent level

domain name system - What is a glue record? - Server Fault
Glue Records and Dedicated DNS

Verifying Domain Name Resolution

# this should show new name server
whois yourdomainname.com
# might show info from old name server due to caching
dig -t NS yourdomainname.com
dig yourdomainname.com NS
dig +trace +additional google.com SOA
# explicitly use a Domain Nameserver
dig -t NS yourdomainname.com @dnserver
# should have yourdomainname in "ANSWER SECTION"

nslookup google.com
host -v google.com
drill google.com

How to Flush DNS in Linux

An Introduction to Managing DNS | DigitalOcean (Series)
How To Set Up a Host Name with DigitalOcean | DigitalOcean

This tool is neat - YouTube nslookup

DiG HOWTO more info than nslookup
Decoding DIG Output
function dy { dig +noall +answer +additional "$1" @dns.toys; }

dog
dog — command-line utility in Rust // Lib.rs

Useful utilities and toys over DNS

SNI

Server Name Identification (SNI), a technology used by servers hosting multiple HTTPS websites. SNI sends the domain name during the TLS 'handshake' that allows an HTTPS connection to be established, during which the domain name is sent in the clear.

Resolving domain

Chris's Wiki :: blog/linux/SystemdResolvedNotes
nss(5) - Linux manual page

Registrars

Hover - domain name and email management made simple
Namecheap.com • Cheap Domain Name Registration & Web Hosting
香港域名註冊有限公司

Freenom - A Name for Everyone many TLDs, at most one year
Dot TK - Find a new FREE domain under Freenom

gTLD Extensions | Discover Your Next Domain - GoDaddy
Domain name registrar and VPS cloud hosting - Gandi.net
Domain Names | Search and Register New Domains, Web Hosting, Website Builder, SSL Certificates | Name.com
DNSPod-免费智能 DNS 解析服务商-电信网通教育网,智能 DNS

FreeDNS - Free DNS - Dynamic DNS - Static DNS subdomain and domain hosting
Free DNS hosting with freedns.afraid.org
JS.ORG | DNS

Namechk | Username, Domain & Trademark Search

AnalogJ/lexicon: Manipulate DNS records on various DNS providers in a standardized way.

Migration

How to Transfer Your Domain to Hostinger | Hostinger Help Center
How to Point a Domain to Hostinger | Hostinger Help Center

DNS Migration: How To Migrate Your DNS Successfully In 6 Steps - RedSwitches

Update info and get EPP code in old hosting (preferably 60 days before)
Import old hosting's email to new hosting
Use new hosting's the nameserver in old hosting
can use new hosting's mail server at this moment
Trigger a Domain Transfer in new hosting
After transfer, you're supposed to be using the old nameserver
migrate gradually