IP%20Addressing%20

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• IP Addressing Dotted-Decimal Notation
• An IP address is 32 bits in size
• Every IP address is grouped into four 8-bit
  octets
• Octets are separated by decimal points
• Valid octet numbers range from 0 to 255 and
  represent a binary number

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• IP Addressing (cont.)
• Each address consists of two parts network id
  and host id
• The network portion of an address indicates
  whether the device belongs to a Class A, B, C, D,
  or E network
• Some octet numbers are reserved for special
  functions
• Dotted decimal notation
• Shorthand convention used to represent IP
  addresses and make them more easily readable by
  people

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Network Mask

• Network id bits in IP address that match the
  1s in the network mask
• Host id bits in IP address that match the 0s
  in the network mask
• Broadcast address Network id and all 1s for
  host id
• Lowest IP address in network Network id plus 1
• Highest IP address in network Broadcast address
  minus 1
• Number of addresses in network is 2n 2 where n
  is number of bits in host id

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Network Mask
11111111.11111111.11111111.00000000
255.255.255.0
Network ID
Host ID
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IP 131.123.165.200 MASK 255.255.0.0   Network
ID Host ID broadcast address highest address in
subnet lowest address in subnet number of
addresses in subnet
10
IP 131.123.165.200 MASK 255.255.0.0   Network
ID 131.123 Host ID broadcast address highest
address in subnet lowest address in
subnet number of addresses in subnet
11
IP 131.123.165.200 MASK 255.255.0.0   Network
ID 131.123 Host ID 165.200 broadcast address
highest address in subnet lowest address in
subnet number of addresses in subnet
12
IP 131.123.165.200 MASK 255.255.0.0   Network
ID 131.123 Host ID 165.200 broadcast address
131.123.255.255 highest address in subnet lowest
address in subnet number of addresses in subnet

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IP 131.123.165.200 MASK 255.255.0.0   Network
ID 131.123 Host ID 165.200 broadcast address
131.123.255.255 highest address in subnet
131.123.255.254 lowest address in subnet number
of addresses in subnet
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IP 131.123.165.200 MASK 255.255.0.0   Network
ID 131.123 Host ID 165.200 broadcast address
131.123.255.255 highest address in subnet
131.123.255.254 lowest address in subnet
131.123.0.1 number of addresses in subnet
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IP 131.123.165.200 MASK 255.255.0.0   Network
ID 131.123 Host ID 165.200 broadcast address
131.123.255.255 highest address in subnet
131.123.255.254 lowest address in subnet
131.123.0.1 number of addresses in subnet
65,534
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IP 131.123.165.200 MASK 255.255.255.0   Networ
k ID Host ID broadcast address highest address
in subnet lowest address in subnet number of
addresses in subnet
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IP 131.123.165.200 MASK 255.255.255.0   Networ
k ID 131.123.165 Host ID broadcast
address highest address in subnet lowest address
in subnet number of addresses in subnet
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IP 131.123.165.200 MASK 255.255.255.0   Networ
k ID 131.123.165 Host ID 200 broadcast
address highest address in subnet lowest address
in subnet number of addresses in subnet
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IP 131.123.165.200 MASK 255.255.255.0   Networ
k ID 131.123.165 Host ID 200 broadcast address
131.123.165.255 highest address in subnet lowest
address in subnet number of addresses in
subnet
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IP 131.123.165.200 MASK 255.255.255.0   Networ
k ID 131.123.165 Host ID 200 broadcast address
131.123.165.255 highest address in subnet
131.123.165.254 lowest address in subnet number
of addresses in subnet
21
IP 131.123.165.200 MASK 255.255.255.0   Networ
k ID 131.123.165 Host ID 200 broadcast address
131.123.165.255 highest address in subnet
131.123.165.254 lowest address in subnet
131.123.165.1 number of addresses in subnet
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IP 131.123.165.200 MASK 255.255.255.0   Networ
k ID 131.123.165 Host ID 200 broadcast address
131.123.165.255 highest address in subnet
131.123.165.254 lowest address in subnet
131.123.165.1 number of addresses in
subnet 254
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CIDR Classless Inter-Domain Routing

• Notation - net-address/n where nnumber of
  bits in network-id
• Alternative to mask notation
• E.g. 131.123.8.0/24 same as 131.123.8.0 with
  netmask 255.255.255.0
• 131.123/16 Kent State Univ. Network
• 131.123.8./22 College of Business

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IP 131.123.165.200 MASK 255.255.254.0   Networ
k ID Host ID broadcast address highest address
in subnet lowest address in subnet number of
addresses in subnet
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IP 131.123.165.200 MASK 255.255.254.0 254
11111110 165 10100101   Network ID
131.123.10100100.0 131.123.164.0 Host
ID broadcast address highest address in
subnet lowest address in subnet number of
addresses in subnet
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IP 131.123.165.200 MASK 255.255.254.0 254
11111110 165 10100101   Network ID
131.123.10100100.0 131.123.164.0 Host ID
0.0.00000001.200 0.0.1.200 broadcast
address highest address in subnet lowest address
in subnet number of addresses in subnet
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IP 131.123.165.200 MASK 255.255.254.0 254
11111110 165 10100101   broadcast address
131.123.10100101.255 131.123.165.255 highest
address in subnet lowest address in
subnet number of addresses in subnet
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IP 131.123.165.200 MASK 255.255.254.0 254
11111110 165 10100101   broadcast address
131.123.10100101.255 131.123.165.255 highest
address in subnet 131.123.165.254 lowest address
in subnet 131.123.164.1 number of addresses in
subnet
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IP 131.123.165.200 MASK 255.255.254.0 254
11111110 165 10100101   number of addresses in
subnet 29-2 512-2 510
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IP 131.123.165.200 MASK 255.255.255.128   Netw
ork ID Host ID broadcast address highest
address in subnet lowest address in
subnet number of addresses in subnet
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• IP 131.123.165.200
• MASK 255.255.255.128
• 10000000
• 200 11001000
•  
• Network ID
• Host ID
• broadcast address
• highest address in subnet
• lowest address in subnet
• number of addresses in subnet

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• IP 131.123.165.200
• MASK 255.255.255.128
• 10000000
• 200 11001000
•  
• Network ID 131.123.165.10000000
• 131.123.165.128
• Host ID
• broadcast address
• highest address in subnet
• lowest address in subnet
• number of addresses in subnet

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• IP 131.123.165.200
• MASK 255.255.255.128
• 10000000
• 200 11001000
•  
• Network ID 131.123.165.10000000
• 131.123.165.128
• CIDR notation 131.123.165.128/25

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• IP 131.123.165.200
• MASK 255.255.255.128
• 10000000
• 200 11001000
•  
• Network ID 131.123.165.10000000
• 131.123.165.128
• Host ID 0.0.0.01001000
• 0.0.0.72
• broadcast address
• highest address in subnet
• lowest address in subnet
• number of addresses in subnet

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• IP 131.123.165.200
• MASK 255.255.255.128
• 10000000
• 200 11001000
•  
• Network ID 131.123.165.10000000
• 131.123.165.128
• Host ID 0.0.0.01001000
• 0.0.0.72
• broadcast address 131.123.165.11111111
• 131.123.165.255
• highest address in subnet
• lowest address in subnet
• number of addresses in subnet

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IP 131.123.165.200 MASK 255.255.255.128 Networ
k ID 131.123.165.10000000
131.123.165.128 Host ID 0.0.0.01001000
0.0.0.72 broadcast address
131.123.165.11111111 131.123.165.255 highest
address in subnet 131.123.165.254 lowest address
in subnet 131.123.165.129 number of addresses
in subnet
39
IP 131.123.165.200 MASK 255.255.255.128 highe
st address in subnet 131.123.165.254 lowest
address in subnet 131.123.165.129 number of
addresses in subnet 27-2 128-2 126