IPv6 Address Range in CIDR Range Tool

Check if an IP address range is in a CIDR range

You can use this tool to determine whether any given IP Address range (in IPv6 format) is a part of a specified CIDR notation range.  It also helps to determine whether or not a specific IP v6 network address belongs in a given range. 

Use this tool to evaluate testing the IP address range presence without any complicated calculations or reasoning. 

How to determine an IP address range is within another range.

1. Input a valid IP address in IPv6 format
2. Input a valid IP address in IPv6 format with the CIDR notation range
3. Click 'Check' to determine if it belongs to the range or not.
4. For instance, to test it, enter the range 2001:DB8::00 and 2001:DB8::00, and the CIDR range  /120 to confirm that it’s in the range.

IPv6 Addresses 

• 2001:0db8:1234:5678:9abc:def0:1234:5678
• fd12:3456:789a:1::2
• 2001:0:9d38:6abd:0:0:0:1
• 2409:8a61:3c0c:85::abcd:5678
• 2001:0db8::1:0:0:0:1
• fe80::1
• 2001:db8::
• 2a02:120b:2c0d:0010:0000:0000:0a0b:0304

These are IPv6 addresses. IPv6 (Internet Protocol version 6) is the most recent version of the Internet Protocol (IP), the communications protocol that provides an identification and location system for computers on networks and routes traffic across the Internet. IPv6 was developed by the Internet Engineering Task Force (IETF) to deal with the long-anticipated problem of IPv4 address exhaustion.

Network layer supernetting

The reverse of subnetting is supernetting. A single large network is partitioned into numerous smaller subnetworks through subnetting. Supernetting is the process of fusing several networks into a larger network called a Supernetwork or Supernet.

Supernetting is mostly used in route summarization, which combines routes to numerous networks with similar network prefixes into a single routing entry that points to a Super network that includes all the networks. As a result, the size of routing databases and routing updates sent across routing protocols are greatly reduced. For example, 192.168.1.0/25 and route 193.168.1.128/25 cannot be combined.

Only a route with a larger block size than the route being summarised can do so. For instance, a route of block size 64 cannot be condensed into a route of block size 32, but two routes of block size 32 can be condensed into a single route of block size 64.

Adding the block sizes of all sequential routes and employing Subnetting, which provides the block size needed to calculate the summary route, are the simplest methods.For example, if we have two sequential routes of block size 16, we can summarize them in a single route of block size 32.

What is CIDR range?

CIDR stands for Classless Inter-Domain Routing. It is a method to allocate and manage IP addresses and their associated routing information more efficiently. CIDR replaces the older classful network addressing scheme, which divides IP addresses into fixed classes (Class A, B, C, etc.).

In CIDR notation, an IP address is represented as a combination of the IP address itself and a suffix indicating the number of significant bits in the network mask. The CIDR range is denoted by combining the IP address and the suffix, separated by a forward slash ("/"). For example:

- IPv4 CIDR range: 192.168.0.0/24

- IPv6 CIDR range: 2001:db8::/32

The CIDR suffix represents the number of bits in the network mask, indicating the size of the network portion of the IP address. The remaining bits represent the host portion. In the examples above, the "/24" in the IPv4 CIDR range means that the first 24 bits of the IP address are the network portion, while the remaining 8 bits are the host portion.

CIDR allows for a more flexible and efficient allocation of IP addresses by enabling networks of different sizes to be created without being restricted to fixed class boundaries. It will allow more precise allocation of IP addresses and more efficient routing of IP traffic on the internet.