Every time you open a website, send an email, join a video call, or connect an application to the Internet, IP addresses are working behind the scenes.
An IP address, or Internet Protocol address, is a numerical identifier used by networks to identify interfaces and direct data toward the correct destination.
You can think of it as part of the Internet's addressing system. Just as a postal system needs destination information to deliver a package, Internet networks need addressing information to move packets of data between networks and devices.
But IP addresses are more than numbers assigned to computers. They are part of a global technical and governance system involving network operators, Internet service providers, Regional Internet Registries (RIRs), and the Internet Assigned Numbers Authority (IANA).
Understanding IP addresses therefore helps us understand not only how the Internet works, but also how one of its most important shared resources is coordinated.
What Is an IP Address?
IP stands for Internet Protocol.
The Internet Protocol provides a standard way for data to be addressed and transmitted across interconnected networks.
An IP address is an address used within that system.
For example, an IPv4 address may look like:
192.0.2.53
An IPv6 address may look like:
2001:db8:1234:5678::1
Today, two major versions of IP are in active use:
- IPv4 — Internet Protocol version 4
- IPv6 — Internet Protocol version 6
IANA describes IPv4 addresses as 32-bit numbers and IPv6 addresses as 128-bit numbers, giving IPv6 a vastly larger theoretical address space. (IANA Number Resources)
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Why Does the Internet Need IP Addresses?
The Internet is not a single network.
It is a global system made up of thousands of independently operated networks that exchange traffic with one another.
For information to travel between these networks, systems need to know where packets are coming from and where they should go.
IP addresses provide this addressing layer.
Suppose you want to visit a website.
Your computer needs a way to communicate with the server hosting that website. The server may be located in another city, another country, or on an entirely different continent.
The Internet Protocol helps packets move across multiple interconnected networks until they reach their destination.
Without a coordinated addressing system, networks would have difficulty determining where Internet traffic should be delivered.
How Does an IP Address Work?
The process involves several different technologies working together.
Imagine entering a website address into your browser.
1. Your device connects to a network
Your computer or smartphone first connects through a network, such as:
- a home broadband connection;
- a mobile network;
- a corporate network;
- a university network; or
- a public Wi-Fi network.
Your device will normally receive an IP address appropriate to that network.
Depending on the network architecture, your device may use a private address internally while your router or service provider uses one or more public addresses to communicate with the wider Internet.
2. DNS translates the domain name
Humans usually prefer names such as:
example.com
Computers and routers ultimately need network addressing information.
The Domain Name System (DNS) helps translate a domain name into information that can be used to reach the appropriate server, including its IP address.
This is why domain names and IP addresses are closely related but are not the same thing.
A domain name gives people an easier way to identify an Internet service, while IP addressing helps networks deliver traffic.
3. Data is divided into packets
Internet communications are transmitted as packets.
Those packets contain information needed to help the network deliver them, including source and destination IP addressing information.
4. Routers forward the packets
Packets may travel through many networks before reaching their destination.
Routers examine routing information and decide where packets should be forwarded next.
A packet does not necessarily travel directly from your laptop to a website's server. Instead, it may cross infrastructure operated by several different network providers.
5. The destination responds
Once packets reach the destination, the server processes the request and sends information back.
This exchange can happen in fractions of a second, even when the communicating systems are thousands of kilometres apart.
It is one example of why globally coordinated Internet standards and number resources are so important.
IPv4 vs IPv6: What Is the Difference?
IPv4 and IPv6 perform the same fundamental addressing function, but their address structures are very different.
| Feature | IPv4 | IPv6 |
|---|---|---|
| Address size | 32 bits | 128 bits |
| Typical format | 192.0.2.53 | 2001:db8::53 |
| Address notation | Decimal | Hexadecimal |
| Theoretical address space | About 4.3 billion addresses | Approximately 3.4 × 10³⁸ addresses |
| Current role | Still extensively used | Designed to support continued Internet growth |
IANA maintains registries for both IPv4 and IPv6 Internet number resources.
What Is IPv4?
IPv4 stands for Internet Protocol version 4.
It uses a 32-bit address space.
An IPv4 address normally appears as four decimal numbers separated by dots:
203.0.113.10
Each of those numbers represents eight bits, giving the complete address 32 bits.
This creates roughly 4.3 billion possible IPv4 addresses.
That number seemed enormous during the Internet's early development. However, global Internet growth eventually made IPv4 address scarcity a major operational and governance issue.
LARUS Foundation discusses the wider consequences in IPv4 Exhaustion and Its Governance Consequences.
What Is IPv6?
IPv6 stands for Internet Protocol version 6.
IPv6 uses 128-bit addresses.
An IPv6 address may look like this:
2001:db8:85a3::8a2e:370:7334
The much larger address space was designed to support the continued expansion of Internet-connected networks and devices.
The technical specification for IPv6 is defined in RFC 8200.
IPv6 deployment, however, is a transition rather than an overnight replacement. IPv4 and IPv6 continue to coexist across today's Internet.
LARUS Foundation explores some of the reasons in Why IPv6 Adoption Is Still Slow.
What Is a Public IP Address?
A public IP address is an address that can be used for communication across the public Internet, subject to routing and network configuration.
Public addressing is important because independently operated networks need globally coordinated address space to communicate without unintended address conflicts.
A business operating Internet-facing servers, for example, may use public IP addresses for services that need to be reachable from external networks.
Public IP addresses are part of the broader Internet number-resource system coordinated through IANA and the Regional Internet Registries.
What Is a Private IP Address?
Not every address used inside a network needs to be globally reachable.
Private IP addresses are commonly used within internal networks such as homes, offices, data centres, and enterprise environments.
Common private IPv4 ranges include:
- 10.0.0.0/8
- 172.16.0.0/12
- 192.168.0.0/16
For example, your home laptop might have an internal address such as:
192.168.1.20
while your home router communicates with the wider Internet using a public address supplied by an Internet service provider.
Private addressing allows many independent networks to reuse the same internal address ranges.
What Is Network Address Translation (NAT)?
Network Address Translation, or NAT, allows addressing information to be translated as traffic moves between networks.
One widespread use of NAT allows multiple devices using private IPv4 addresses to communicate externally through a smaller number of public IPv4 addresses.
For example, a household may contain:
- three smartphones;
- two laptops;
- a smart television;
- a game console;
- security cameras; and
- other connected devices.
Internally, these devices can have different private addresses while Internet-facing traffic may appear to originate from the same public IPv4 address.
NAT became particularly important as IPv4 resources became scarce and helped extend IPv4's operational life.
It is important, however, not to confuse NAT with IPv6 itself. IPv6 addresses the limitations of IPv4's address space at the protocol level rather than simply providing another mechanism for sharing scarce IPv4 addresses.
Static vs Dynamic IP Addresses
Another common distinction is between static and dynamic IP addressing.
Static IP Address
A static IP address is configured or assigned so that it remains stable rather than regularly changing.
Static addressing can be useful for infrastructure such as:
- servers;
- network gateways;
- business applications;
- remote-access systems; and
- services that depend on predictable addressing.
Dynamic IP Address
A dynamic IP address can change over time and is commonly assigned automatically.
Internet service providers often use dynamic addressing for consumer connections, while local networks commonly use protocols such as DHCP to assign addresses to connected devices.
Neither approach is universally better.
The correct choice depends on the network's technical and operational requirements.
Does an IP Address Reveal Your Exact Location?
Not necessarily.
An IP address can provide information about the network through which Internet traffic is being sent, and geolocation databases may associate address ranges with an approximate geographic area.
However, an IP address should not automatically be treated as an exact physical location for an individual.
There are several reasons:
- addresses may be dynamically reassigned;
- multiple people can share one public IP address;
- corporate networks may route users through central infrastructure;
- mobile networks can use complex address-sharing systems;
- VPNs and proxies can change the apparent source address; and
- geolocation databases can be incomplete or inaccurate.
An IP address is therefore an important network identifier, but it does not necessarily identify a particular person or exact physical address.
Who Manages IP Addresses?
No single company simply owns or controls the entire global Internet address system.
Internet number resources are coordinated through a hierarchical system designed to maintain uniqueness and global interoperability.
At the top level, IANA maintains global registries for IPv4 addresses, IPv6 addresses, and Autonomous System Numbers (ASNs). (IANA Number-Related Registries)
Large blocks of address space are coordinated with the world's Regional Internet Registries (RIRs).
The five RIRs serve different regions:
- AFRINIC — Africa
- APNIC — Asia Pacific
- ARIN — United States, Canada and parts of the Caribbean
- LACNIC — Latin America and parts of the Caribbean
- RIPE NCC — Europe, the Middle East and parts of Central Asia
RIRs maintain registration systems and administer Internet number resources according to their regional policies.
Network operators, Internet service providers, cloud providers, hosting companies, universities, enterprises, governments, and other organisations may then receive or manage resources within this wider framework.
Why Have IPv4 Addresses Become Scarce?
The central limitation of IPv4 is mathematical.
A 32-bit address space provides approximately 4.3 billion possible addresses, and not every possible address is available for ordinary public Internet use.
As the Internet expanded to billions of users, organisations, servers, mobile systems, and connected devices, the available IPv4 pool became increasingly constrained.
The Internet community responded in several ways, including:
- more efficient address allocation;
- classless routing;
- private address space;
- Network Address Translation;
- IPv4 transfer mechanisms; and
- deployment of IPv6.
IPv4 scarcity has consequently transformed IP addressing from a purely technical subject into an economic and governance issue as well.
LARUS Foundation examines this relationship in Registry Governance and IPv4 Scarcity: Why Policy Shapes Supply.
Why IP Addresses Are Also an Internet Governance Issue
It is easy to think of an IP address as simply a technical number.
But someone must decide how Internet number resources are allocated, registered, transferred, documented, and coordinated.
Those decisions can affect:
- network competition;
- infrastructure development;
- routing stability;
- entry opportunities for new operators;
- regional Internet growth;
- access to scarce IPv4 resources;
- adoption of IPv6; and
- the resilience of the global Internet.
This is where Internet governance enters the picture.
Internet governance is not limited to government regulation. It also involves technical organisations, network operators, businesses, researchers, civil society, and Internet users participating in the development of policies and standards that allow independently operated networks to function together.
IP address governance provides a strong example.
The technology may be highly technical, but decisions about access to and stewardship of Internet number resources can have consequences for the broader digital economy.
Why Accurate IP Resource Management Matters
The Internet depends on coordination.
If separate organisations attempted to use the same public address space without a globally coordinated system, conflicts and operational uncertainty could arise.
Effective number-resource management therefore helps support several important principles.
Uniqueness
Public Internet number resources must be coordinated to avoid unintended duplication.
Registration
Reliable registry information helps the Internet community understand which organisations are responsible for particular number resources.
Accountability
Clear resource records make it easier for network operators and other stakeholders to contact responsible organisations when operational or abuse-related issues arise.
Stability
Consistent coordination helps independently operated networks remain interoperable.
These are not merely administrative concerns. They contribute to the stability of the global Internet.
For a deeper discussion, see How IP Address Management Impacts Long-Term Internet Stability.
From a Simple Number to Global Infrastructure
For an everyday Internet user, an IP address may appear to be nothing more than a string of numbers and letters.
Behind that address, however, sits a much larger system.
There are technical standards that define how addresses work.
There are routers that use addressing and routing information to move packets.
There are registries that coordinate number resources.
There are network operators that deploy them.
And there are communities that develop policies governing how these resources are administered.
Understanding IP addresses therefore provides an entry point into understanding the Internet itself.
The Internet works because thousands of independent networks agree to use interoperable technologies, globally coordinated identifiers, and shared technical standards.
That combination of technology, coordination, and governance is what enables a device in one part of the world to communicate with infrastructure almost anywhere else.
Frequently Asked Questions About IP Addresses
1. What does IP address mean?
IP address means Internet Protocol address. It is an address used by the Internet Protocol to help identify network interfaces and direct packets between networks.
2. What are the two main types of IP addresses?
The two main Internet Protocol versions in active use are IPv4 and IPv6. IPv4 uses 32-bit addresses, while IPv6 uses 128-bit addresses.
3. What is the difference between a public and private IP address?
A public IP address can be used for communication across the public Internet when properly routed. Private addresses are intended for use inside private networks and are not globally routed in the same way.
4. Can two devices have the same IP address?
Two devices on different private networks can use the same private IP address. For globally coordinated public Internet addressing, address space must be managed to prevent unintended conflicts. NAT can also allow multiple devices to share a public IPv4 address for external communication.
5. Does an IP address show where someone lives?
An IP address may indicate information about the network or an approximate geographic area, but it does not necessarily reveal a person's exact physical location. Dynamic addressing, NAT, mobile networks, VPNs, and inaccurate geolocation databases can all affect location information.
6. Why are IPv4 addresses limited?
IPv4 uses a 32-bit address space, producing roughly 4.3 billion possible addresses. The growth of the Internet eventually exceeded what this original addressing model could comfortably support.
7. Will IPv6 replace IPv4?
IPv6 was designed to support the Internet's long-term growth with a much larger address space. However, IPv4 and IPv6 currently coexist, and the global transition to IPv6 continues gradually.
8. Who controls IP addresses?
There is no single organisation controlling every IP address. IANA coordinates global Internet number registries, while Regional Internet Registries administer resources within their respective regions under established policy frameworks.
Conclusion
An IP address is one of the Internet's most fundamental building blocks.
It enables networks to identify destinations and exchange data, whether someone is loading a webpage, accessing a cloud application, sending an email, or connecting infrastructure across continents.
IPv4 established the addressing foundation of the modern Internet, while IPv6 provides a much larger address space for its continued development.
But the story of IP addresses extends beyond technology.
The way Internet number resources are allocated, registered, transferred, and governed can influence competition, connectivity, infrastructure resilience, and the future development of the Internet.
That is why understanding IP addresses is also an important first step toward understanding Internet governance.
At LARUS Foundation, we believe more people should be able to understand the infrastructure and policies that shape the Internet. Greater technical understanding makes it easier for network operators, researchers, students, policymakers, and Internet users to participate meaningfully in discussions about the Internet's future.