IP Address Basics

1

What Is an IP Address?

Learn what IP addresses are, how they work, and why every device on the internet needs one.

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2

Public vs Private IP Addresses

Understand the difference between public and private IPs, RFC 1918 ranges, and how NAT connects them.

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3

How to Find Your IP Address

Step-by-step instructions to find your public and private IP on Windows, Mac, Linux, and mobile.

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4

IP Geolocation: How Accurate Is It Really?

Explore how IP geolocation works, its accuracy limitations, and why your IP might place you in the wrong city.

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5

IP Reputation and Blacklists Explained

Understand how IP reputation scoring works, why addresses get blacklisted, and how to check and restore your IP's standing.

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6

Carrier-Grade NAT (CGNAT): What It Means for You

Learn how ISPs use CGNAT to share public IPs among hundreds of customers and what it means for gaming, hosting, and privacy.

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7

Network Address Translation (NAT) Explained

Learn how NAT translates private IP addresses to public ones, enabling millions of devices to share a single public IP.

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8

IP Address Classes (A, B, C, D, E)

Understand the original classful IP addressing system with Class A through E, their ranges, and why CIDR replaced it.

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9

Loopback & Localhost: 127.0.0.1 Explained

Understand the loopback interface, why 127.0.0.1 is special, and how localhost is used for local development and testing.

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10

How IP Addresses Are Assigned (IANA, RIRs, ISPs)

Trace the chain of IP address allocation from IANA to Regional Internet Registries to ISPs and finally to your device.

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11

IP Spoofing: Risks and Prevention

Learn how attackers forge source IP addresses, the threats IP spoofing enables, and the defenses that protect against it.

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12

What's My IP: How IP Detection Works

Discover how websites detect your IP address, the role of HTTP headers, proxies, VPNs, and what your IP reveals about you.

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13

Multicast, Anycast, and Broadcast Explained

Learn the three methods of one-to-many communication in IP networks: multicast, anycast, and broadcast.

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14

IPv4 Address Exhaustion: Causes and Solutions

Understand why the 4.3 billion IPv4 addresses ran out, the timeline of exhaustion, and the technologies extending IPv4's life.

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15

IP Address Conflicts: Causes and Fixes

Learn what causes IP address conflicts on your network, how to diagnose them, and proven methods to resolve and prevent duplicate IP issues.

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16

IPv4 Header Structure Explained

Break down the IPv4 packet header field by field, understanding version, TTL, protocol, checksum, and addressing fields.

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17

IANA and IP Address Governance

Understand how IANA, ICANN, and the multistakeholder model govern IP address allocation and internet numbering resources.

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18

Regional Internet Registries (ARIN, RIPE, APNIC)

Explore the five RIRs that manage IP address distribution globally, their service regions, policies, and WHOIS databases.

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19

IP Address Privacy: What Your IP Reveals

Learn what personal information your IP address exposes, how it is used for tracking, and practical steps to protect your privacy.

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20

IP Address Lookup: Best Tools and Databases

Discover the best tools and databases for looking up IP addresses, including WHOIS, geolocation services, and threat intelligence platforms.

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21

IP Geolocation: How Accurate Is It Really?

How IP geolocation databases work, why they are often wrong, and what factors determine accuracy at country, region, and city levels.

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22

Carrier-Grade NAT (CGNAT) Explained

What CGNAT is, how ISPs share IPv4 addresses across thousands of subscribers, and how it affects hosting, gaming, P2P, and remote access.

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