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Ip Adresses Classes and Special-Use Ip Address Space

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Submitted By pennyenright
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IP ADRESSES CLASSES AND SPECIAL-USE IP ADDRESS SPACE
NT2640
ENRIGHT
3/19/2016
DURAZO

ENRIGHT
NT2640

“Class A IP addresses were used for networks that had a large number of hosts on the network. The class permitted up to 126 networks by using the first octet of the address for the network identification. The first bit in this octet was always fixed or set to be zero. The following seven bits in the octet were then set to one which would complete the network identification” (tech faq, n.d.). In class A the most significant bits begin with a zero. In class B they begin with a 10. The class C begin with a 110. Class D IP addresses were reserved for multicasting purposes. These addresses begin with an octet in the 224-239 range. They would have leading bits of 1 1 1 0 and includes addresses from 224.0.0.0 to 239.255.255.255. I. RFC 1918 address ranges are: 10.0.0.0/8 (10.0.0.0 - 10.255.255.255) 172.16.0.0/12 (172.16.0.0 - 172.31.255.255) 192.168.0.0/16 (192.168.0.0 - 192.168.255.255)
As required by RFC 1918, these addresses will never be routed outside the campus network. II. RFC 1918 addresses that IST will not route inside campus are: 10.0.0.0/12 (10.0.0.0 - 10.15.255.255) 192.168.0.0/16 (192.168.0.0 - 192.168.255.255)
Campus computer users can use addresses in those two ranges however they like, confident that these addresses will not be routed by IST.

ENRIGHT
NT2640
III. RFC 1918 addresses that IST may route inside campus are: 10.16.0.0/12 10.32.0.0/11 10.64.0.0/10 10.128.0.0/9 (10.16.0.0 - 10.255.255.255) 172.16.0.0/12 (172.16.0.0 - 172.31.255.255)
RFC1918 conserves globally unique IP addresses by providing three blocks of addresses that are never officially allocated to any organization. These blocks can then be

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