Meaning: Classless inter-domain routing
- A way for assigning IP addresses and IP routing.
- A collection of IP standards to be able to give unique identities to devices.
Replaces the following class system
- Class A address
- from 1.x.x.x -> 126.x.x.x
- Class B Address
- from 128.0.x.x -> 191.255.x.x
- Meaning the second bit can be allocated from the range of 0 to 255
- Class C
- from 192.0.0.x -> 223.225.255.X
- Appending to the Class B rules to the third point out of fourth, notice the first point sequentially getting bigger and bigger
- Class D
- from 224.0.0.0 -> 239.255.255.255
- used for multicasting, again appending to the last rule and again increasing the addresses for the first point
- Class E
- Reserved class
- 240.0.0.0 -> 255.255.255.254
- For Research and development purposes
This block contains IP addresses. This block consists of 3 basic rules.
Rule 1: In the CIDR block, the IP addresses which are allocated to the hosts should be continuous. uu
Rule 2: The size of the block should be of power 2 and should be equal to the total number of IP addresses.
Rule 3: The size of the block must be divisible by the first IP address of the block.
The current standard of the internet, internet protocol version 4 is currently forty years old, introduced in 1981. Key points:
- 32 bit address system or four bytes
- 4,294,967,296 (
$2^{32}$ ) - Limiting
- 4,294,967,296 (
- Example
- 255.255.255.1
- Uses a Dot decimal notation for human readability, not for actual use
- 11111111.11111111.11111111.00000001
- Actual binary nuberi
- 255.255.255.1
The introduced and eventual replacement of IPv4, specifically made in 1995 to tackle the numbers issue imposed by IPv4.
- total number of address
- 128 bit system
- 34,359,738,368
- Table used to determine a destination following a subnet mask and what kind of interface
- Used for all physical mediums
