IPv6 CIDR to Range Calculator converts the given IPv6 CIDR to its range parameters. The range parameters include First IP, Last IP, Block Size of a given range, and more. This tool instantly converts the given IPv6 CIDR to its range parameters. Example format for calculation is 2001:4860:4860::8888/32
CIDR stands for Classless Inter-Domain Routing (also known as supernetting), which assigns the Internet Protocol (IP) addresses that improve the efficiency of address distribution and replace the old system based on Class A Class B, and Class C networks.
The CIDR came with two initial goals.
Because of that, the number of available internet addresses has significantly increased.
With the development of the Domain Name System (DNS), the classful method was designed to distribute IP addresses. But the original classful network design contained some inefficiencies that drained the pool of unassigned IP addresses faster than expected. The classful routing system included the following.
You can quickly tell to what address class an IP address belongs to just by looking at it.
However, the real problem occurred in the classful routing system when an organization needed more than 254 host identifiers.
Suppose a company required more than 254 IP addresses. It would be switched to a Class B license. However, in that case, more than 60,000 IP addresses would remain unused if a company did not need them. That would result in the exhaustion of the available IP addresses. To overcome that issue, Internet Engineering Task Force (IETF) introduced the CIDR in 1993.
Classless Inter-Domain Routing (CIDR) is based on variable-length subnet masking (VLSM), allowing network engineers to distribute an IP address space into a hierarchy of subnets of varying sizes. Therefore, it makes it possible to create subnetworks with varying host counts without wasting large numbers of IP addresses.
The CIDR IP addresses are made up of two sets of numbers.
Putting it together, a CIDR notation may look like: 192.168.129.23/17. Here, the first 17 bits are the network part of the address, while the last 15 bits are for host addresses.
IPv4 addresses are 32-bits long. You can apply the same CIDR notation rule to IPv6 addresses. The only difference is that IPv6 addresses can contain up to 128-bits.
CIDR blocks are IP addresses that share the same prefix and the same number of bits. The length of the prefix determines the size of CIDR blocks. The short prefix allows more addresses, thus making a more significant block. While the larger prefix represents fewer addresses, it makes a small block.
Internet Assigned Numbers Authority (IANA) initially controls the blocks. IANA is responsible for distributing large IP addresses blocks to Regional Internet Registries (RIRs).
On subnetting, we relied on Network ID, Subnet ID, and Host ID. However, in CIDR, the Network IP and Subnet ID are merged into one. In CIDR, we get that slash notation (/). This slash notation is called CIDR notation. CIDR rejects the concept of address classes completely, allowing an address to be defined by only two Individual IDs.
CIDR reduces the wasting of IP addresses without creating an outburst in the number of entries in a routing table. It's now a backbone of routing systems on the internet.
The CIDR notation is also used for the IPv6 addresses with the same syntax. The only difference between IPv4 and IPv6 is that IPv4 is 32-bits long, and IPv6 is 128 bits long.
To utilize the IPv6 CIDR calculator. Perform the following steps.
You can also convert the given IPv6 Ranges to their corresponding CIDR by using the IPv6 Range to CIDR Calculator.
