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Interesting answers by others but difficult to understand as words.
Try this link instead.
http://www.hill2dot0.com/wiki/images/4/40/IP_Address_Classes.jpg
it's very easy look at the1st octet
if it's class A the rang it's between0 to126
if it's class B the rang btween128 to191
it it's class C the rang btween192-223
In a Class A Network binary address start with0, therefore the decimal number can be anywhere from1 to126. The first8 bits (the first octet) identify the network and the remaining24 bits indicate the host within the network. An example of a Class A IP address is102.168.212.226, where "102" identifies the network and "168.212.226" identifies the host on that network.
In a Class B Network, binary addresses start with10, therefore the decimal number can be anywhere from128 to191. The number127 is reserved for loopback and is used for internal testing on the local machine. The first16 bits (the first two octets) identify the network and the remaining16 bits indicate the host within the network. An example of a Class B IP address is168.212.226.204 where "168.212" identifies the network and "226.204" identifies the host on that network.
Binary addresses start with110, therefore the decimal number can be anywhere from192 to223. The first24 bits (the first three octets) identify the network and the remaining8 bits indicate the host within the network. An example of a Class C IP address is200.168.212.226 where "200.168.212" identifies the network and "226" identifies the host on that network.
Class A
إذا رأينا أي عنوان IP يبتدئ بأي رقم بين0 و127 سنعرف أنه ينتمي الى المدى Class A
Class B
عناوين هذا المدى تتميز بما قرره المصممين من أن أول bit من أول byte من عنوان الشبكة المنتمي للمدى Class B لابد أن تكون قيمته1
Class C
عناوين هذا المدى تتميز بما قرره المصممين من أن البت الأول و الثاني من البايت الأول يحملان القيمة1 بينما يحمل البت الثالث القيمة0 دوما