WeekEnd Take Away - Technical Basics - IP(Internet Protocol) - Part 1

Document created by Lohith Shamaiah Employee on Aug 28, 2015Last modified by Lohith Shamaiah Employee on Sep 2, 2015
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Whole internet stands on the foundation of IP addresses, today lets go back and brush up on our technical skills relating to IP addresses.

 

The Internet Assigned Numbers Authority (IANA) manages the IP address space allocations globally.

 

IP addresses are classified into 3 main classes. Class A, Class B, Class C

 

 

Class A  0*******.********.********.********

 

Class B 10******.********.********.********


Class C 110*****.********.********.********


IP addresses are divided into 4 parts separated by a dot (.), each part is known as OCTET.

Each octet is equal to 8 bits. IPv4 => 8*4(octets) = 32bits


Class A


IP addresses will always have first bit under first octet as 0

Lowest value under Class A is 0, where as highest is 127. (How? see below)


Lowest 0

128
6432168421
00000000

 

Highest 127

128
6432168421
01111111

 

0 and 127 are reserved IPs. 0 is the network address, 127 is loopback testing address.

Above 2 IP address cannot be used for any device in the network.


Any IP falling in the range of 0 and 126 are Class A IP address.


Ex :

Binary    01110101.10011000.01000011.00001111

Decimal 117.152.67.15


Class B


First 2 bits in the first octet under Class B IP addresses will be occupied by 1 0

Lowest value under Class B is 128, highest is 191.


Lowest 128

128
6432168421
10000000

 

Highest 191

128
6432168421
10111111

 

Any IP falling in the range of 128 and 191 are Class B IP address.


Ex :

Binary    10100111.00100010.01110101.01011110

Decimal 167.34.117.94


Class C


First 3 bits in the first octet under Class C IP addresses will be occupied by 1 1 0

Lowest value under Class B is 192, highest is 223.


Lowest 192

128
6432168421
11000000

 

Highest 223

128
6432168421
11011111


Any IP falling in the range of 192 and 223 are Class C IP address.

 

Ex :

Binary    11000001.01111111.01010010.01000000

Decimal  193.127.85.64

 

 

Above details are just few pointers to give you an overview of the IP addresses which we use day in and day out.

I will share more details on IP addresses in coming days. Hope this document helped you in understanding the classes under IP addresses.

 

Please feel free to correct and comment.

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