Every device connected to the internet is assigned an IP address — a unique numerical label that serves as both an identifier and a locator within the global network. Internet Protocol version 4 (IPv4) addresses, written as four decimal numbers separated by dots (e.g., 192.168.1.1), have been the backbone of internet communication since the 1980s. However, with only about 4.3 billion possible addresses, the IPv4 pool has been exhausted, driving the transition to IPv6.

IPv6 addresses use 128 bits instead of 32, providing approximately 340 undecillion unique addresses — enough for every grain of sand on Earth to have its own address. Written in hexadecimal groups separated by colons (e.g., 2001:0db8::1), IPv6 is being gradually adopted worldwide, with some countries like India, Germany, and France leading at over 50% adoption rates.

IP addresses reveal more than just network identity. Through geolocation databases, an IP address can indicate a user's approximate country, city, and even postal code. It also points to the Internet Service Provider (ISP) and the Autonomous System Number (ASN) — the network operator that routes traffic across the internet. Organizations like IANA delegate IP blocks to Regional Internet Registries (AFRINIC, APNIC, ARIN, LACNIC, and RIPE NCC), which then allocate them to ISPs and enterprises in their respective regions.