An IP address (Internet Protocol Address) is a unique numerical identifier assigned to every device connected to a network. Just like a postal address, it allows data packets to be sent to the correct recipient. Without IP addresses, targeted communication on the internet would be impossible.
There are two types of IP addresses: public and private. Your public IP address is what websites see when you visit them – it is assigned by your Internet Service Provider (ISP). Your private IP address is only visible within your home network and is assigned by your router (e.g. 192.168.1.100).
IPv4 uses 32-bit addresses written as four numbers between 0 and 255, separated by dots – for example 203.0.113.42. This allows approximately 4.3 billion unique addresses (2³²).
That sounds like a lot – but with smartphones, smart TVs, IoT devices and computers worldwide, IPv4 addresses are practically exhausted. Since 2011, the IANA has stopped issuing new IPv4 blocks to regional registries.
IPv6 uses 128-bit addresses, enabling approximately 340 undecillion unique addresses – enough for every square millimeter of the Earth's surface. An IPv6 address looks like this: 2001:0db8:85a3::8a2e:0370:7334.
IPv6 also brings built-in security through IPsec, more efficient routing and no need for NAT (Network Address Translation).
Most home connections receive a dynamic IP address – it changes with each connection or after a set period. This is beneficial for privacy as it makes tracking more difficult.
Businesses and server providers often use static IP addresses that never change. This is important for services like email servers, web hosting and VPNs.
Yes – but only to a limited extent. An IP address can typically reveal your ISP, country and roughly your region (city or state). An exact street address or home location cannot be determined from an IP address alone. Law enforcement can request subscriber information from the ISP – this is not possible for regular users.
Every device on the internet needs an IP address to communicate. IPv4 addresses (32-bit) are nearly exhausted, which is why the transition to IPv6 (128-bit) is underway. Your public IP address reveals your ISP and approximate location but not your exact address. Dynamic IPs change regularly, while static IPs remain constant and are used for servers and business connections.