What is an IP address? An Internet Protocol address (IP address) is a unique numerical label assigned to each device, such as a computer, smartphone, or printer, in a computer network that utilizes the Internet Protocol for communication. Think of it as a digital home address for your hardware. An IP address role has been characterized by three main functions:

  • Identification: A name that indicates what device we seek on the network.
  • Location: An address that indicates where the device is located geographically or logically.
  • Routing: A route that indicates how to get data packets from one point to another.

Each Dedicated Server, Windows VPS, Linux VPS, or router on the internet can have one or multiple IP addresses. The original designers of the Internet Protocol defined an IP address as a 32-bit number. This system, known as Internet Protocol Version 4 (IPv4), is still the most widely recognized standard in use today. For high-performance needs, users often buy VPS hosting to secure a stable IP environment.

However, due to the explosive growth of the internet and the predicted depletion of available addresses, a new version of IP (IPv6), using 128 bits for the address, was developed in 1995. IPv6 was standardized as RFC 2460 in 1998, and its deployment has been ongoing since the mid-2000s to support the billions of new devices coming online.

IP addresses are usually written and displayed in human-readable notations, such as 172.16.254.1 (IPv4) and 2001:db8:0:1234:0:567:8:1 (IPv6). The Internet Assigned Numbers Authority (IANA) manages global IP address space allocations. It delegates five regional Internet registries (RIRs) to allocate IP address blocks to local Internet registries (Internet service providers) and other entities. In this guide, we will include and explain everything about IP addresses, including their types and versions.

For a deeper understanding of IP addresses, especially in the context of their usage and benefits, check out our article on What Is a Dedicated IP?.

🚀 What is an IP Address?

An IP address is a set of numbers used for labelling any device connected to the network in which Internet Protocols are used as a communication medium. The full form of IP is Internet Protocol, developed in the 1970s. It serves as the internet protocol's cornerstone, providing the fundamental rules for how a device exchanges information across the global web. All devices connected to the internet must have a specific IP address to be reachable, meaning that billions of IP addresses are currently in active use.

There are two primary IP address versions, IPv4 and IPv6, which we will explain in detail later in this guide. IPv4 is the legacy version that provides a theoretical space of more than four billion IP addresses. Currently, IPv6 is gradually replacing IPv4 because it can provide trillions upon trillions of unique addresses to fulfill the massive requirements of modern internet users. The IPv4 version uses numerical values that may sometimes conflict or run out, whereas IPv6 uses a hexadecimal method to ensure a unique identity for every single grain of sand on earth if necessary.

For a deeper understanding of IP addresses and their importance, especially in relation to security and website management, you can read about the benefits of using a dedicated IP address in our article "Dedicated IP Benefits".

💡 How IP Addresses Work (Step-by-Step)

To understand the journey of data, consider this simplified flow of how your IP address interacts with the web:

  1. Connection: Your device connects to the network via an Internet Service Provider (ISP).
  2. Assignment: The ISP assigns an IP address to your modem or router.
  3. Request: When you visit a website, your request is sent to the ISP, which routes it using your IP.
  4. Return: The destination server sees your IP and sends the data back to your specific "digital address."

🔍 Types of IP Address

Understanding the different categories of IP addresses is crucial for networking. There are several different types of IP addresses based on their scope and assignment:

🏠 Private IP Address

A private IP address is the type of address assigned to a device connected to a local business or home network. If a user has multiple devices (like a laptop, smart TV, and phone) connected to a single ISP or Internet Service Provider, then all those internal devices will have a specific private IP address. These addresses allow devices on the same network to talk to each other. Crucially, anyone cannot access the private IP address from devices outside the user's local network, providing a layer of inherent security. However, a private IP address is not globally unique; millions of homes might use the same 192.168.1.1 address internally.

You can find your device's private IP address through a few simple techniques. For Windows users, open the Windows command prompt and execute the ipconfig command. If you have a Mac, enter ifconfig in the terminal app. In Android, navigate to the WiFi settings to find the IP details. On iOS, tap the 'i' button next to the connected network name. If you are managing a server, knowing the VPS IP is the first step in remote configuration.

For more detailed instructions on how to obtain your IP address specifically in Linux, you can refer to our guide on how to get an IP address in Linux.

🌐 Public IP Address

The public IP address is the primary address through which your entire business or home network is identified on the global internet. The public IP address works to connect your local network to the rest of the world. Unlike private IPs, each public IP address must be globally unique. Your ISP typically assigns this to your router. You can find out your public IP address using multiple online tools and search engines by simply typing "What is my IP."

⚖️ Static vs. Dynamic IP Addresses

An IP address can be categorized by how it is assigned: static or dynamic.

  • Static IP Address: This address will never change. It is a permanent Internet address often used for hosting websites, mail servers, or Remote Desktop Protocol (RDP) services.
  • Dynamic IP Address: This is a temporary address assigned each time a computer or device connects to the Internet. It is pulled from a pool of addresses by a DHCP server.
Feature Static IP Dynamic IP
Consistency Remains the same always Changes periodically
Cost Usually more expensive Included in standard plans
Use Case Web hosting, VOIP, Servers General home browsing

Four regional Internet registries—ARIN, RIPE NCC, LACNIC, and APNIC—historically assigned Internet addresses from the following three classes:

Class Network Capacity Typical Use Case
Class A Supports 16 million hosts on each of 126 networks. Large corporations and global entities.
Class B Supports 65,000 hosts on each of 16,000 networks. Medium-sized organizations.
Class C Supports 254 hosts on each of 2 million networks. Small businesses and local networks.

The number of unassigned Internet addresses is running out, so a new classless scheme called CIDR (Classless Inter-Domain Routing) is gradually replacing the system based on classes A, B, and C. This transition is closely tied to the adoption of IPv6, where the IP address size is significantly increased from 32 bits to 128 bits.

🔄 IP Versions: IPv4 vs. IPv6

There are two IP versions which are IPv4 addresses and IPv6 addresses. For a detailed breakdown, see our IPv4 vs IPv6 comparison.

🔢 IPv4 Addresses

In IPv4, an address consists of 32 bits which limits the address space to 4,294,967,296 (2^32) possible unique addresses. IPv4 reserves some addresses for special purposes, such as private networks (~18 million addresses) or multicast addresses (~270 million addresses).

IPv4 addresses are canonically represented in dot-decimal notation, consisting of four decimal numbers ranging from 0 to 255, separated by dots, e.g., 172.16.254.1. Each part represents a group of 8 bits (octet) of the address. In some cases of technical writing, IPv4 addresses may be presented in various hexadecimal, octal, or binary representations.

🌐 IPv6 Addresses

The rapid exhaustion of IPv4 address space prompted the Internet Engineering Task Force (IETF) to explore new technologies to expand the addressing capability on the Internet. The permanent solution was deemed to redesign the Internet Protocol itself.

This new generation of Internet Protocol was eventually named Internet Protocol Version 6 (IPv6) in 1995. The address size was increased from 32 to 128 bits (16 octets), thus providing up to 2^128 (approximately 3.403×10^38) addresses. It is deemed sufficient for the foreseeable future.

The new design intent was not to provide just a sufficient quantity of addresses but also to redesign routing on the Internet by more efficient aggregation of subnetwork routing prefixes. It resulted in slower growth of routing tables in routers.

The smallest possible individual allocation is a subnet for 2^64 hosts, which is the square of the size of the entire IPv4 Internet. At these levels, address utilization rates will be small on any IPv6 network segment. The new design also provides the opportunity to separate the addressing infrastructure of a network segment, i.e., the local administration of the segment's available space, from the addressing prefix used to route traffic to and from external networks.

IPv6 has facilities that automatically change the routing prefix of entire networks, should the global connectivity or the routing policy change, without requiring internal redesign or manual renumbering. A large number of IPv6 addresses allows large blocks to be assigned for specific purposes and, where appropriate, to be aggregated for efficient routing.

There is no need to have complex address conservation methods used in CIDR with a large address space. All modern desktop and enterprise server operating systems include native support for the IPv6 protocol. Still, it is not yet widely deployed in other devices, such as residential networking routers, voice over IP (VoIP) and multimedia equipment, and network peripherals.

To explore useful tools for scanning and managing IP addresses effectively, check out our guide on advanced IP scanner tools.

❓ Frequently Asked Questions (FAQ)

  • Can I hide my IP address? Yes, you can use a VPN or a proxy server to mask your actual IP address with a different one.
  • Does my IP address reveal my physical location? It reveals your general geographic area (city or region) and ISP, but usually not your exact house number.
  • Why does my IP change? If you have a dynamic IP, your ISP rotates addresses to manage their network pool more efficiently.
  • What is the difference between IP and MAC addresses? An IP address is assigned by software (logical), while a MAC address is hard-coded into your network card (physical). You can read more about IP vs MAC address here.

🎯 Conclusion

This was the complete breakdown of what an IP address is and its different versions. As mentioned earlier, every device has a unique IP address, which is a series of numbers that identifies the device on the internet. There are several types of IP addresses, as discussed in the previous section, and IPv4 and IPv6 are the two main versions used for devices.

Many people are opting for IPv6 VPS over IPv4 as it provides trillions of IP addresses, ensuring a vast supply to meet the growing demand for unique addresses. This version offers more variety and is ideal for future scalability. While IPv6 currently meets the needs of most users, researchers suggest that a new version may be necessary in the future due to the continuous increase in connected devices. For businesses seeking more stable and unique IP solutions, opting for a residential IP VPS can further enhance their online presence by providing a more reliable and geo-specific IP address. The growing number of devices worldwide emphasizes the importance of both IPv6 and residential IP solutions.

For those interested in learning how to effectively change their IP address, whether for privacy or other reasons, check out our detailed guide on how to change your IP address. Understanding your network configuration is the first step toward better Linux server security.

People also read: