![]() You probably noticed that the number 127 was skipped. ![]() Note: Class D (224 – 239) is used for multicast testing, and Class E (240 – 255) is reserved for future use.ĪPIPA addresses on the 169.254 network are part of Class B. If you have a small network at home, it is simplest and most common to use Class C. You realize that this classification system was created to appease different organizations of different sizes. Take a look at Table 1 and try to get a feel for the different IP classes available. Table 2 shows the IP classes and their associated default subnet masks, which, as we mentioned, identify which portion of the IP address is the network portion and which is the host portion. Table 1 shows the various classes and their associated IP address ranges. In that case, the first number is 192, which means that the IP address is part of a Class C network. When working with classful IPv4 addresses, the first number in the IP address dictates what class the address is part of. It’s embedded at the end of the article too.) (I also have a video about the differences between classful and classless here. But I do get questions from time to time on the subject, so if you are interested, read on… Because of this I have omitted most of the classful information from the upcoming A+ Exam Cram (to be released in 2019). Most companies make use of a classless network (or CIDR), so classful IP is not as important anymore. I wrote this article to discuss IPv4 classes and classless addressing and compare the two.
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