What is my IP address?




What is my IP? It’s an odd question in most people’s minds, yet it’s one of the top ten most-searched questions on Google.

Those who know what an IP address is will already know most of these searches are coming from people who understand what they’re searching for. But for the rest of us a more relevant question might be: what is an IP address?

Across the globe there are billions of computing devices that connect to the internet. To communicate, each device needs an address, just like our homes.

Our home address is typically structured along the lines of “number, street, city, postcode, country”. And our entire postal delivery network is based on this system.

Our digital world is similar, and has an address system that allows network traffic to move around the internet. So, an IP (internet protocol) address — which also has its own implicit structure — is fundamentally a numeric address for an endpoint on the internet.

IP addresses serve a similar function to postal addresses. Postal addresses allow our mail to circulate, while IP addresses allow network traffic to move around the internet.

An online content delivery system

Akin to postal addresses, IP addresses are assigned to each recipient in a worldwide infrastructure. The recipient could be a single device such as a laptop, phone, tablet or even your air-conditioner controller — but could also be a network entry point to a large organisation.

Since its inception, IP was designed with simplicity and efficiency in mind. That’s why it has remained effective at handling internet traffic, starting on a network with four nodes in the late 1960s, to billions of devices today.

An IP address is a number in binary format, which means it has 32 digits (or bits) comprising 1s and 0s. The address is typically grouped as four 8-bit numbers, so each number is eight digits that are either a 1 or 0.

But we usually view IP addresses in a decimal format, wherein the value between 00000000-11111111 becomes a number between 0 and 255. So the complete IP address space ranges from through to

IP addresses are centrally managed by the Internet Assigned Numbers Authority, which delegates to one of five regional registries: Africa, America, Asia-Pacific, Latin America and Europe-West/Central Asia.

Not all addresses are available for use by anyone. Many are reserved for specific purposes. For example, three ranges of addresses (—,— and— are reserved for private networks such as your home.

IPv6: a new frontier

IPv4 (version 4) is the most widely used version of IP in the world right now. Dating back to the 1980s, it has a capacity of more than four billion unique addresses — which was considered enough back then.

But a combination of wasteful use (such as organisations being allocated larger IP address spaces than they need), and the exponential increase of users, is causing this space to run out.

For now, IPv4 is still here. But its demise has long been predicted and it will eventually no longer be fit for purpose. There are technical solutions, however.

The most useful ones are Network Address Translation (more on this later) and a newer version of IP: version 6. Although IPv6 is newer than IPv4, it isn’t really “new”. It was originally proposed some 25 years ago.

The shift to IPv6 brings a range of benefits, even if they are basically transparent as far as consumers are concerned. The most significant change with IPv6 is the increase in the size of IP addresses from 32 bits to 128 bits.

Version 6 also boosts the total number of unique IP addresses on offer, up to some 340,282,366,920,938,463,463,374,607,431,768,211,456. Even with the rapid rise in device usage, this address pool should last us a long time.