What Is An IP Address? A Comprehensive Guide To Internet Protocol

10 min read
13 September 2021
Ignas Anfalovas

Learn the ins and outs of the Internet Protocol address.

What is an ip address

IP addresses are unique identifiers responsible for sending data to the correct location on the internet or a local network. They basically make communication via the internet possible. 

IP stands for Internet Protocol, which is a set of rules that facilitates data communication between networks. Each internet-connected network or device within a network needs an Internet Protocol address to send and receive data. 

The format of an IP address is a set of numbers separated by dots or colons. For example, (Internet Protocol version 4) or 1301:7db8:86a3:3010:0000:8a4e:0474:7104 (Internet Protocol version 6). The number and range of these values separated by punctuation depend on the type/version of the IP address. 

IP addresses are allocated by the Internet Assigned Numbers Authority (IANA), a subsidiary of the Internet Corporation for Assigned Names and Numbers (ICANN), a nonprofit organization based in the US. 

IANA doesn’t assign IP addresses individually but instead assigns them en masse to organizations, institutions and internet service providers who then assign them on a smaller scale. 

How do IP addresses really work?

Information transmitted over the internet is sent in discrete blocks, called packets, which contain the data a recipient requests and a sender wants to communicate. 

If you think of these packets as physical parcels, an IP address is like the postal address a sender uses to make sure the parcel gets to the right recipient. 

The process of being assigned and using an IP address generally looks like this:

  1. Networks are assigned IP addresses by internet service providers (ISPs).
  2. Your device connects to a network that assigns your device an IP address.
  3. The device sends requests to other IP addresses belonging to websites or servers.
  4. Your ISP routes packets from those websites or servers back to your IP address.
  5. You can access websites and information stored on other connected devices and servers.

IP address types

Since IP addresses are so fundamental to the running of the internet, it will come as no surprise that they break down into a number of different types depending on their purpose and the needs of their assignee. 

Types of IP addresses you’ll hear referred to include:

  • Static
  • Dynamic
  • Public
  • Private
  • Dedicated
  • Shared
  • IPv4
  • IPv6

These types fall into separate sub-categories, each representing a different feature or function of IP addresses. 

Public vs. Private IP addresses

Any Wi-Fi network in your home or at your office will have both public and private IP addresses. Whether in a private home or part of a company network, these are consumer IP addresses. 

Private IP address

Any given Wi-Fi network will have many connected devices, including computers, smartphones or speaker systems. With the growth of the Internet of Things (IoT) market, a home network is now increasingly likely to include multiple internet-connected devices, like smart appliances. 

To allow the network router to differentiate each device connected to the network, a unique IP address is assigned to every single one of them. Because each of these specific IP addresses is relevant only within the specific network, this is known as a private IP address. 

Public IP address

While all devices on the same network have private IP addresses, the network itself (more specifically, the router) has its own public IP address. This is the primary IP address for the network. 

The public IP address for a network is allocated to the router by an ISP. Internet service providers have pools of IP addresses they can allocate to customers. 

Public IP addresses are the destination IP addresses for data sent to a network. The router then uses its private IP addresses to ensure the data gets to the right device. 

Diagram shows how messages are transmitted from user devices to destination IPs.
User devise to destination IP

Static vs. Dynamic IP addresses

To confuse things a little further, there are two different types of public IP addresses: static or dynamic. As the names might suggest, one of these IP address types remains the same while the other changes periodically. Let’s dive into the why. 

Dynamic IP addresses

If a network is assigned a dynamic IP address, its specific IP address will regularly change. The ISP takes care of this automatically. It assigns you a new IP address and returns your old one to its pool. 

The vast majority of networks, especially home networks, don’t need to have the same IP address for long, and using dynamic IP addresses doesn’t impact the network’s performance overall. 

Assigning IP addresses dynamically saves internet service providers money, theoretically making the average home IP address more affordable. A changing IP also makes it harder for cybercriminals to access your network interface or track your internet activity. 

Static IP addresses

In some instances, however, a network will need its own IP address that always stays the same. This is the static IP address. 

Static IP addresses primarily serve individuals or businesses that host their own servers. The websites and email addresses associated with such servers need their own, consistent digital addresses to ensure they’re always discoverable online. 

Because a static IP address makes your network infrastructure more prone to cyber threats, it’s not the best solution for private networks not managed by experts. 

Dedicated vs. Shared IP addresses

When you’re talking about the websites and servers which host content on the internet, an internet service provider will offer IP addresses that are either dedicated or shared. 

Dedicated IP address

Some individuals and organizations choose to purchase hosting plans with a dedicated IP address. This means that their website is assigned a unique IP address that it doesn’t share. 

This has advantages like facilitating a File Transfer Protocol server, making it easier to get an SSL certificate and making file transfers within an organization more secure. However, it also usually comes with a higher price tag. 

Shared IP address

For most websites with a reasonable number of pages and amount of traffic, a shared IP address is all they need. In this situation, multiple websites are on the same server and share an IP address. 

This generally comes with lower hosting costs and is suitable for the majority of small to medium-sized business websites. 

IPv4 and IPv6

There are different formats of IP addresses with varying numbers of digits. The most commonly used format is IPv4, but IPv6 is becoming increasingly more popular. Let us briefly explain why and compare IPv4 vs. IPv6


The common format of an IP address in use today is IPv4. It has 4 numbers between 0 and 255 separated by dots. An IPv4 address might look something like this:

The anatomy of an IPv4 address with four blocks with eight bits in each.
IPv4 anatomy

This format allows for around 4.3 billion unique IP addresses, which seemed like a lot before we had global connectivity and your fridge became a connected device. 


With the explosion in the number of computers and other connected devices trying to connect to the internet in the past decades, it’s become increasingly clear that IPv4 cannot provide enough addresses for the growing demand. 

To give every connected device access to the World Wide Web, we need to make many more IP addresses available. That’s why IPv6 emerged. 

IPv6 uses eight groups of four hexadecimal characters to create new combinations for IP addresses. An IPv6 address might look something like this:

The anatomy of an IPv6 address with a routing prefix, subnet ID and interface ID.
IPv6 anatomy

Using this format, there are 340,282,366,920,938,463,463,374,607,431,768,211,456 IP addresses available. This is, in theory, more than we’ll ever need. 

What are IP address security threats and how to protect your IP address

You should already know that there are risks associated with surfing the internet, but do you know about the specific risks associated with your IP address being shared online? Here are just a few. 

IP address security threats

Tracking your location

As well as being a kind of digital address that helps communicate data, your IP address can also reveal your physical location via the public internet. 

Geolocation tools can associate your IP address with a specific region, state or city. With the right skills and know-how, hackers might be able to track down your geolocation too. 

Attacking your network

It’s no secret that any computer network is susceptible to a cyberattack. It’s easy for a hacker who knows your IP address to flood your network with access requests.

They use multiple devices to send simultaneous requests to your IP for data, making it seem as if multiple people are trying to contact your network at the same time.

Distributed denial of service (DDoS) attacks can have the effect of shutting down your internet access temporarily. 

Using your IP for illegal downloads

In the wrong hands, your IP address can land you in a situation where you could become the victim of identity theft. 

Suppose a hacker wants to share or download content illegally online. In that case, whether it’s something relatively harmless like a copyrighted song or something much more sinister like child exploitation material, they might conceal their true identity using your IP. 

Although you are not breaking the law, law enforcement may involve you in an investigation.

Hacking your device

While uncommon, it is possible for hackers who know your IP address to gain access to your personal devices. 

By exploiting the ports associated with your IP address, a bad actor may be able to force a connection and steal personal information from your smartphone or other devices. They may even install malware on your device that could compromise your security long-term. 

IP address protection

Now that you’re all worried about the threats your IP addresses face, it’s time for the good news: There are a few simple steps you can take to ensure that your IP address and online activity stay safe while you surf. 

Use a proxy server

One solution to hiding your IP address and activity online is to make use of a proxy server.

A proxy server is an online service that routes information through an intermediary server between your device and the internet. 

This means that when you visit other websites, the servers hosting those websites will only see the proxy server’s IP and not your own. When information is sent back to you, it is routed via the proxy server. 

This is a great option, provided you find a proxy server you can trust. Unreputable proxy servers exist, and they may track your activity and put your private network at risk. 

Use a VPN

Connecting computers or mobile devices to a Virtual Private Network (VPN) makes it appear as if your device and the VPN are on the same local network, even if you’re accessing it from halfway around the world. 

Instead of sending information directly to and from your device’s actual network, data is sent via a secure connection to and from the VPN. 

As well as the IP and data security benefits, VPN also offers extra encryption when using public Wi-Fi and allows you to change the location you appear to be accessing the internet from. 

When to use a VPN

  • When you need privacy. Each time you visit a website, it logs your IP address and attaches cookies. Using a VPN when surfing the web keeps you safer and your data more private. 
  • On public Wi-Fi. Hackers on the same Wi-Fi network as you may have access to your personal information. A VPN encrypts all data you send over an unsecured Wi-Fi network. 
  • When working remotely. Being able to connect to company servers remotely offers you and your colleagues security while accessing internal resources. 
  • When you need to access geo-targeted content. Some websites are blocked in certain countries. Furthermore, online services like Netflix offer different content depending on where you are. 
Flow chart showing internet connection with and without VPN.
How a VPN works

The future of IP addresses

At this point, hopefully, it’s clearer what an IP address is, and you also understand how important IP addresses are to how the internet functions and how we use it. 

IP addresses are part of a shifting internet landscape, and looking into the future of how we use the internet also means looking at how we organize IP addresses. 

Whether it’s solving the problem of the IPv4 shortage, shifting to IPv6 or embracing change while ensuring the sustainability of the internet, IP addresses are and will remain a big part of the future of the internet. 

IPv4 as the future of IP addresses

While it is true that there are a finite number of IPv4 addresses available due to their format, the real problem we face now is one of allocation rather than a problem of availability. 

When IANA first allocated IP addresses starting in the early days of the internet, it over-allocated addresses to some organizations and institutions. The pool of unallocated IPs became smaller, but many IPs that were allocated remain unused even today. 

The entire internet infrastructure is already optimized for IPv4, their use is already widespread, and you don’t need to do anything to prepare your systems to use IPv4. This means that while the shift to IPv6 may be inevitable, in the meantime, the demand for IP addresses can be solved by allocating unused resources to those who need them. 

IPv6 as the future of IP addresses

IPv6 was first created in 1995. For the last decade or so, the buzz regarding IPv6 being the future of the internet has been growing. As mentioned previously, IPv6’s plentiful variations mean it can solve any scarcity problems surrounding IPv4. 

Nonetheless, IPv6 is still not very widely used, and that’s for a pretty simple reason. 

Reconfiguring systems to work with IPv6 isn’t just about changing your system preferences. Instead, it involves a whole load of work to untangle and reconfigure all of the intertwined systems currently working with IPv4. 

It’s pretty commonly agreed that IPv6 has a vital role in the future development of the internet. While it may not be fully integrated into the existing systems, it is likely to be used to build new infrastructures from the ground up. Even though IPv6 adoption has been slow, it is evident it will not stop. 

A graph showing IPv6 adoption statistics among Google users between 2013-2021.
IPv6 adoption among Google users between 2013 and 2021

Internet and IP address sustainability

The key to understanding IP addresses is to think about how necessary they are for the sustainable growth of the internet. With the boom in internet connectivity and so many websites in need of hosting, the demand for unique IPs is growing. 

IPXO embraces and promotes the sustainability of the internet, and we’ve set our sights on ensuring that the IP needs of the world can be met with convenience. 

We don’t see the apparent shortage of IPv4 addresses as a need to switch to new technologies, but rather a challenge to connect those who need IPs with those who have IPs to spare. There are still plenty of IPv4 addresses owned by companies and institutions that are currently not using them. 

IPXO offers the opportunity to monetize unused IP resources and provides a simple solution for those who need IP addresses. Not only do we help alleviate the IPv4 shortage problem, but we also put accessibility and innovation at your fingertips. 

Whether you’re looking for access to IP addresses or have unused IP resources, we invite you to explore our fully automated IP marketplace and discover how our services can work for you.

About the author

Ignas Anfalovas

Platform Engineering Manager

Ignas is a Platform Engineering Manager at IPXO with more than 7 years of experience in the IT sector. His expertise includes network design solutions and infrastructure maintenance. After working hours, you will find Ignas in Lithuanian folk-dance classes.
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