Who’s Got Class and Who’s Special
We live in a time of marvel and discovery. We have phones and computers in our pockets and in our cars. Our workplaces expect us to use equipment that literally can talk to the world. These things are so much a part of our lives that we forget they are the result of years of development and standardizing. The wonders of that result are far overshadowed by the systems that enable them to work.
At the most basic level the internet is like a huge mail delivery system. While that is a vast simplification, it gives a framework to understand why and how some of the fundamental rules came into play. Originally there ...view middle of the document...
0.0.0, which allows for 16,777,214 hosts on each of 126 networks. This number is arrived at by recalling that each octet can have 255 places. The first and last addresses on any network are used as the network ID and broadcast address, respectively (Shimonski, R. and Alperon, N., 2009).
With a basic understanding of how a Class A network address is set up it is easy to absorb the same information about Class B and Class C networks. Class B addresses have the first two binary digits set to one-zero, so 10000000 to10111111 or 128 to 191. The first two octets in a Class B address are network ID and the last two are host ID (subnet mask 255.255.0.0). This gives the opportunity for 65,534 hosts on each of 16,384 networks. This is smaller than Class A, and Class C is smaller yet. Class C addresses are ones with the first three binary digits set to one-one-zero, so 11000000 to 11011111 or 192 to 223. The subnet mask is 255.255.255.0 with three network octets and one host octet. This class offers 254 hosts on 2,097,152 networks (Shimonski, R. and Alperon, N., 2009).
Class D and Class E addresses follow the same pattern. Class D addresses use 224 to 239 in the first octet and are used for multicasting, or sending to multiple systems. Class E use 240 to 255 and are reserved for future or experimental use (Shimonski, R. and Alperon, N., 2009).
Most IP addresses are considered public and are used for routing on the internet. These are requested and assigned by Regional Internet Registries (RIRs) that make assignments for different regions of the world. Some addresses are specifically classified as...