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What is an IP address?

An IP Address, or Internet Protocol Address, is a unique string of numbers separated by periods (in IPv4) or colons (in IPv6) that identifies each computer using the Internet Protocol to communicate over a network.It serves as a digital address that allows data to be routed to the correct location on the internet, similarly to how a postal address works for physical mail.

Key Functions of an IP Address

  • Identification: It uniquely identifies a device on a network, ensuring that data sent over the internet reaches the correct destination.
  • Location Addressing: Although it doesn’t pinpoint the exact physical location, it can provide general location info such as country, city, or ISP, which is used for various purposes including content personalization and restrictions.
  • Network Interface Differentiation: In networks where multiple devices are connected, each device’s IP address differentiates it from others, facilitating smooth communication.

Types of IP Addresses

Public IP Addresses: These are used on the wider internet and are assigned by ISPs. They ensure devices can be uniquely identified on the global network.
Private IP Addresses: Used within private networks (like home or office networks), these addresses allow for devices within the network to communicate with each other but not directly with the internet without a router or NAT (Network Address Translation).

IPv4 vs. IPv6

IPv4: This is the most widely used IP version, consisting of four sets of numbers ranging from 0 to 255, separated by periods (e.g., 192.168.1.1). Due to the exponential growth of internet devices, IPv4 addresses are running out.
IPv6: Developed to tackle the IPv4 exhaustion, IPv6 uses a 128-bit address space, allowing for a virtually unlimited number of devices. Its format includes eight groups of four hexadecimal digits (e.g., 2001:0db8:85a3:0000:0000:8a2e:0370:7334).