IP Address

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Summary
An IP address is a unique numerical label assigned to every device on a network. Understand the difference between IPv4 and IPv6 and how they work in Bangladesh.

Summary

An IP Address (Internet Protocol address) is a unique numerical label assigned to every device connected to a computer network. It serves two main functions: identifying the host (or its network interface) and providing the location of the device in the network so that data can find its way to the correct destination.

Overview

Think of an IP address as your house’s mailing address in the digital world. Just as a letter needs a physical address to reach your home, a data packet (like a YouTube video or an email) needs an IP address to reach your computer or smartphone. Without an IP address, devices cannot communicate with each other over the internet.

Technical Deep-Dive

IPv4 (Internet Protocol version 4)

This is the most common type of IP address. It consists of four sets of numbers separated by dots (e.g., 103.145.12.5).

  • Format: 32-bit address.
  • Capacity: Can support approximately 4.3 billion unique addresses.
  • Limitation: We have officially run out of new IPv4 addresses globally.

IPv6 (Internet Protocol version 6)

Created to replace IPv4, IPv6 uses a much longer format (e.g., 2001:0db8:85a3:0000:0000:8a2e:0370:7334).

  • Format: 128-bit address.
  • Capacity: Virtually unlimited (340 undecillion addresses).
  • Benefit: Improved security and better routing efficiency.

Structure of an IP

An IP address is divided into two parts:

  1. Network ID: Identifies the specific network the device belongs to.
  2. Host ID: Identifies the specific device within that network.

Bangladesh Context

In Bangladesh, IPv4 remains the dominant standard, though IPv6 adoption is slowly increasing among major IIGs and ISPs.

The IPv4 Shortage and CGNAT

Because there aren’t enough IPv4 addresses for everyone, most ISPs in Bangladesh use CGNAT (Carrier-Grade NAT). This means one public “Real IP” is shared by hundreds of home users.

  • The Impact: Shared IPs can cause issues with online gaming (high ping/strict NAT), hosting local servers, or some websites seeing your connection as “suspicious” due to high traffic from a single IP.
  • The Solution: Many ISPs offer a “Dedicated/Real IP” for an extra monthly fee (usually 100-200 BDT) for users who need a unique identity on the web.

FAQ

  • Q: Is my IP address permanent?
    • A: No. Most home connections use Dynamic IP addresses that change periodically. Only a Static IP (usually paid) remains permanent.
  • Q: Does my IP address show my physical home address?
    • A: Not exactly. It shows your general location (like your city or neighborhood) and your ISP’s name, but not your specific house number.

Related Content

References