30 lines
981 B
Markdown
Executable File
30 lines
981 B
Markdown
Executable File
# IPv4 Address
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- 32-bit
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- 2^32 4,294,967,296 possible addresses under IPv4 - now ran out.
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- Can be referred to in binary, hex, octal, dotted decimal and decimal.
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- 10.10.10.10 (Dotted Decimal)
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- 00001010.00001010.00001010.00001010 (Decimal)
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- Structured to aid routing
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- Network Number (globally unique, find correct network)
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- Host Number (locally unique, find correct node)
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- ^ outdated
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- No. bits allocated to each part varies depending on how many host numbers needed (see: subnetting, netmask)
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- Nodes with the same network number are on same network, and vice versa.
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- Network number tells transmitter which case is true.
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## Classful IP Addresses
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- A and B have large address ranges.
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- Either need multiple network numbers, or use subnets to pretend you have multiple network numbers
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- One LAN per building, big network likely to be split into smaller networks. (Subnets)
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255.0.0.0
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/8
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16.0.0.0
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255.255.0.0
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/16
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255.255.255.0
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