What Are Reserved IP Addresses and How Do You Use Them?

Reserved IP Addresse

What Are Reserved IP Addresses? Wondering if you need to reserve one or if it’s already taken care of for you? Well, a reserved IP is something you set aside for your own use and can be assigned to an instance or load balancer whenever you need it. In this article, we’ll dive deep into the world of reserved IP Addresses.

In the realm of Internet addressing architecture, the Internet Engineering Task Force (IETF) and the Internet Assigned Numbers Authority (IANA) have designated specific Internet Protocol (IP) addresses for special purposes.

Perhaps the most well-known reserved IP is, commonly known as the loopback address. This little gem is used for testing network adapters or integrated chips. Any data sent to stays within your local system and won’t traverse the local network or the vast expanse of the public internet.

IP addresses serve as the backbone of any network, and that includes the vast landscape of the Internet. Yet, with countless randomly generated IP addresses out there, devices like routers crave a stable, easy-to-remember address for frequent access.

Adding to the complexity, we’ve got a finite number of IPv4 addresses to work with on the internet, making it quite the challenge to assign a unique IP to every single device connecting to the web. But fear not, this is where reserved IP addresses swoop in to save the day. They play a vital role in every network, turning administrative tasks into a far more predictable endeavour.

What Is a Reserved IP Address?

A Reserved IP address is a specific IP address assigned exclusively to your account. Whether you use this Reserved IP for a device or not, it will remain available to you unless you decide to release it.

When you browse the internet and access websites, you’re actually connecting to servers identified by their IP addresses, which are masked behind user-friendly URLs (Uniform Resource Locators). However, not all IP addresses are equal. They are categorized into five classes, ranging from Class A to Class E. (Troubleshooting Guide: Your IP Address Has Been Temporarily Blocked)

Certain IP addresses from classes A, B, and C are set aside as private IP addresses, accessible only within localized networks like those in universities or offices. These private IP addresses serve the purpose of creating a distinct range of IPs within the already limited IPv4 address space. By using private IP addresses for each network, the demand for unique IP addresses globally can be significantly reduced.

For example, let’s consider your home Wi-Fi network or any local network. If you check your computer’s IP address, you’ll notice a number like 192.168.xx.xx. This differs from your global IP address, which is assigned to the router instead of individual devices. In case you need to find all IP addresses on your network, we’ve also covered how to do that when the need arises.

How Do You Use Reserved IP Addresses?

In most cases, reserving IP addresses on a network isn’t necessary since devices usually come with pre-configured IP addresses, allowing easy network access.

Yet, you have the flexibility to tinker with a specific subset of reserved IP addresses within your network. By doing so, you can manually assign “static” IP addresses to specific devices on your local network, and this can be accomplished through your router’s DHCP settings.

The precise steps to carry out this process may vary depending on the make, model, and network requirements of your router. Nevertheless, you will likely find these settings tucked away under IP assignment or DHCP server settings on your router.

Here’s how you can set a static IP Address using the Windows settings:

  • Head to the Start menu search bar, type in ‘settings,’ and select the best match. Alternatively, press the Windows Key + I to launch the Settings menu.
  • Then head to Network & Internet settings.
  • Look for the Properties button. It’s right next to your connection settings.
  • Scroll down and look for the IP assignment section. Then click on Edit.
  • In the new Edit IP settings dialogue box, click on the scroll-down menu and select Manual.
  • Toggle on the switch for the IPv4 button.
  • Fill in all the network details here, including the IP address, Subnet mask, and Gateway, and then click on Save.

Commonly Reserved IP Addresses for IPv4 and IPv6


Address blockAddress rangeAddress Range– network– for local communications within a private network.– address space for communications between a service provider and its subscribers when using a carrier-grade NAT.– for loopback addresses to the local host.– for link-local addresses between two hosts on a single link when no IP address is otherwise specified, such as would have normally been retrieved from a DHCP server.– for local communications within a private network.– Protocol Assignments, DS-Lite (/29).– as TEST-NET-1, documentation and examples.– Formerly used for IPv6 to IPv4 relay– for local communications within a private network.– for benchmark testing of inter-network communications between two separate subnets.– as TEST-NET-2, documentation and examples.– as TEST-NET-3, documentation and examples.– use for IP multicast. (Former Class D network.) as MCAST-TEST-NET, documentation and examples.– for future use. (Former Class E network.) for the “limited broadcast” destination address.


Address block (CIDR)UsagePurpose
::/128SoftwareUnspecified address
::1/128HostLoopback address
::ffff:0:0/96SoftwareIPv4-mapped addresses
::ffff:0:0:0/96SoftwareIPv4 translated addresses
64:ff9b::/96Global InternetIPv4/IPv6 translation
64:ff9b:1::/48Private internetsIPv4/IPv6 translation
100::/64RoutingDiscard prefix
2001:0000::/32Global InternetTeredo tunnelling
2001:db8::/32DocumentationAddresses used in documentation and example source code
2002::/16Global InternetThe 6to4 addressing scheme (deprecated)
fc00::/7Private internetsUnique local address
fe80::/64 from fe80::/10LinkLink-local address
ff00::/8Global InternetMulticast address

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