Network Layer (3) – IP Addressing
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Layout of an IP Address – network part and host part |
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0 |
8 |
16 |
24 |
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0 |
Default route 0.0.0.0 |
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1-126 Class A (0xxx) |
Up to 16,777,214 hosts |
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127 |
Reserved for loopback addresses |
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128-191 Class B (10xx) |
255 networks |
Up to 65534 hosts |
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192-223 Class C (110x) |
Over 2 million networks |
Up to 254 hosts |
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224-239 Class D (1110) |
Multicast addresses |
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240-248 Class E (1111) |
Reserved |
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255 Broadcast |
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10 Class A |
One “Non routable” Class A network for private use |
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172 Class B |
16 thru 31 - Sixteen “Non routable” Class B networks for private use |
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192.168 Class C |
255 “Non routable” Class C networks for private use |
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239.0.0 Class D |
“Non routable” Class D addresses for private use (RFC 2365) |
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Linksys defaults to 192.168.1 |
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Classless Inter-Domain Routing (CIDR) e.g., 11.11.11.11/8 |
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Dynamic Host Control Protocol lets the ISP assign an IP address |
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DHCP can also assign Domain Name Server (DNS) server addresses and other information at connect time. |
