From Domain to IP: Demystifying DNS Records in Minutes

🧠 First: Big Picture

DNS is basically a huge phonebook:
👉 “Human-readable name” → “IP address”

Example:
quizmaker.co.in → 104.18.2.119

But instead of just one mapping, DNS stores different types of records (RRs) for different purposes.

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🧩 Key Terms (Super Important)

1. 🌐 Domain Name

A domain name is the main name registered on the internet.

👉 Example:
quizmaker.co.in

• Think of it as your brand / root identity
• Managed at domain level

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2. 🏠 Hostname

A hostname is a specific machine/service under a domain.

👉 Examples:
www.quizmaker.co.in
api.quizmaker.co.in
relay1.main.quizmaker.co.in

👉 Structure:
[hostname].[domain]

So:

• quizmaker.co.in → domain
• relay1.main.quizmaker.co.in → hostname (specific server/service)

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3. 🎯 IP Address

The actual address of a machine on the internet

👉 Example:
104.18.2.119

• Computers talk using IPs, not names

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4. 🔁 Canonical Name

“Canonical” = real/original name

A canonical name is the true hostname of a server.

👉 Used in CNAME records

Example:
relay1.main.quizmaker.co.in → server1.primary.quizmaker.co.in

Here:

• relay1.main.quizmaker.co.in = alias
• server1.primary.quizmaker.co.in = canonical (real) name

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🔗 Now Let’s Understand Each Record Type

🅰️ A Record (Most Important)

👉 Maps hostname → IP address

(A, relay1.main.quizmaker.co.in, 104.18.2.119)

Meaning:

• Hostname: relay1.main.quizmaker.co.in
• IP: 104.18.2.119

📌 This is what ultimately lets your browser connect

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🟡 NS Record (Name Server)

👉 Tells: “Who is responsible for this domain?”
Maps domain name → hostname

(NS, quizmaker.co.in, relay1.main.quizmaker.co.in)

Meaning:

• Domain: quizmaker.co.in
• Hostname: relay1.main.quizmaker.co.in

📌 Used during DNS lookup process

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🔁 CNAME Record (Alias)

👉 Maps alias hostname → real (canonical) name

(CNAME, relay1.main.quizmaker.co.in, server1.primary.quizmaker.co.in)

Meaning:

• Alias: relay1.main.quizmaker.co.in
• Real server: server1.primary.quizmaker.co.in

📌 Then DNS will do:
relay1.main.quizmaker.co.in → 104.18.2.119 (via A record)
server1.primary.quizmaker.co.in → 104.18.2.119 (via A record)

So CNAME = indirection layer

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📧 MX Record (Mail Server)

👉 Tells where emails should go

(MX, mail.quizmaker.co.in, mailserver1.backup.quizmaker.co.in)

Meaning:

• Email domain: mail.quizmaker.co.in
• Mail server: mailserver1.backup.quizmaker.co.in

📌 Used by email systems (SMTP)

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⚖️ Differences (Crystal Clear)

Concept	Meaning	Example
Domain Name	Root identity	quizmaker.co.in
Hostname	Specific service	relay1.main.quizmaker.co.in
Canonical Name	Real/original hostname	server1.primary.quizmaker.co.in
IP Address	Machine address	104.18.2.119

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🔄 End-to-End Example (Putting It All Together)

Let’s say you type:
https://quizmaker.co.in

DNS might do:

CNAME:
quizmaker.co.in → server1.primary.quizmaker.co.in

A record:
server1.primary.quizmaker.co.in → 104.18.2.119

Browser connects to:
104.18.2.119

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🧠 Intuition (Real-world analogy)

Think of it like this:

• Domain name = Company name
• Hostname = Specific office
• Canonical name = Official registered office
• IP address = GPS coordinates

CNAME is like:
👉 “This office is actually handled by another main office”

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⚡ Key Takeaways

• Domain = top-level identity
• Hostname = specific service under domain
• Canonical name = actual server name (used in CNAME)
• IP address = real machine location
• A record = final step (name → IP)
• CNAME = alias layer (name → name → IP)

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📖 Want a better reading experience?

👉 Visit the full blog here: https://quizmaker.co.in/creators/@swati_goyal_911/blog/from-domain-to-ip-demystifying-dns-records-in-minutes