Binary Lesson 5Binary Lesson 5Classful IP Addresses Classful IP Addresses
IP Addresses (version 4)IP Addresses (version 4)
IP addresses are 32 bits longIP addresses are 32 bits long Four bytes or "octets"Four bytes or "octets" Examples:Examples:
147.144.1.212147.144.1.212 1.2.3.41.2.3.4 192.168.0.1192.168.0.1
Each octet must be in the range 0 to Each octet must be in the range 0 to 255255
Network and Host PortionsNetwork and Host PortionsClass A AddressesClass A Addresses
An IP address of 1.2.3.4 specifies both An IP address of 1.2.3.4 specifies both the the networknetwork and the and the hosthost
The The networknetwork portion tells the Internet portion tells the Internet routers where to send packetsrouters where to send packets
The The hosthost portion tells routers on the portion tells routers on the destination LAN which host the packet destination LAN which host the packet is destined foris destined for
Network and Host PortionsNetwork and Host PortionsClass A AddressesClass A Addresses
For Class A addresses like 1.2.3.4For Class A addresses like 1.2.3.4 The The networknetwork portion is the first octet portion is the first octet
11 The The hosthost portion is the last three octets portion is the last three octets
2.3.42.3.4 This system was used until 1981This system was used until 1981
1981:1981:Class A, B, C AddressesClass A, B, C Addresses
Class A (1.2.3.4)Class A (1.2.3.4) Network portion: first octet (1)Network portion: first octet (1) Host portion: last three octets (2.3.4)Host portion: last three octets (2.3.4)
Class B (140.5.6.7)Class B (140.5.6.7) Network portion: first two octets (140.5)Network portion: first two octets (140.5) Host portion: last two octets (6.7)Host portion: last two octets (6.7)
Class C (199.7.8.9)Class C (199.7.8.9) Network portion: first three octets (199.7.8)Network portion: first three octets (199.7.8) Host portion: last octet (9)Host portion: last octet (9)
First Octet Determines ClassFirst Octet Determines Class
Class A Class A First octet from 1 to 127First octet from 1 to 127
Class B Class B First octet from 129 to 191First octet from 129 to 191
Class C Class C First octet from 192 to 223First octet from 192 to 223
Network and Host PortionsNetwork and Host Portions
Consider this address: 147.144.0.1Consider this address: 147.144.0.1 Class BClass B
The first 2 octets determine the networkThe first 2 octets determine the network 147.144147.144
The last two octets determine the hostThe last two octets determine the host 0.10.1
Classful Classful Addressing Addressing
iClicker iClicker QuestionsQuestions
What class is this address in?What class is this address in?15.254.222.19915.254.222.199
A.A. Class AClass A
B.B. Class BClass B
C.C. Class CClass C
D.D. That address is not validThat address is not valid
1 of 11
What class is this address in?What class is this address in?215.2.1.254215.2.1.254
A.A. Class AClass A
B.B. Class BClass B
C.C. Class CClass C
D.D. That address is not validThat address is not valid
2 of 11
What class is this address in?What class is this address in?185.2.1.0.2185.2.1.0.2
A.A. Class AClass A
B.B. Class BClass B
C.C. Class CClass C
D.D. That address is not validThat address is not valid
3 of 11
What class is this address in?What class is this address in?147.144.1.312147.144.1.312
A.A. Class AClass A
B.B. Class BClass B
C.C. Class CClass C
D.D. That address is not validThat address is not valid
4 of 11
What class is this address in?What class is this address in?147.144.1.212147.144.1.212
A.A. Class AClass A
B.B. Class BClass B
C.C. Class CClass C
D.D. That address is not validThat address is not valid
5 of 11
What is the network portion of What is the network portion of this address?this address?2.255.14.1932.255.14.193
A.A. 22
B.B. 2.2552.255
C.C. 2.255.142.255.14
D.D. 193193
E.E. 14.19314.1936 of 11
What is the host portion of this What is the host portion of this address?address?222.22.2.2222.22.2.2
A.A. 222222
B.B. 222.22222.22
C.C. 222.22.2222.22.2
D.D. 22
E.E. 2.22.27 of 11
What is the network portion of What is the network portion of this address?this address?100.200.255.1100.200.255.1
A.A. 100100
B.B. 100.200100.200
C.C. 100.200.255100.200.255
D.D. 11
E.E. 255.1255.18 of 11
What is the host portion of this What is the host portion of this address?address?
101.99.254.2101.99.254.2
A.A. 101101
B.B. 101.99101.99
C.C. 22
D.D. 254.2254.2
E.E. 99.254.299.254.29 of 11
What is the network portion of What is the network portion of this address?this address?
193.192.193.191193.192.193.191
A.A. 192192
B.B. 192.192192.192
C.C. 193.192.193193.192.193
D.D. 191191
E.E. 193.191193.19110 of
11
What is the host portion of this What is the host portion of this address?address?
147.144.1.212147.144.1.212
A.A. 147147
B.B. 147.144147.144
C.C. 1.2121.212
D.D. 212212
E.E. 144.1.212144.1.21211 of
11
Top Related