<Jeremy's IT Lab> Day7: IPv4 Addressing

IPv4 Addressing

e.i)

192.168.1.254/24

 

구간별 2진수 8자리 계산

192 > 11000000

168 > 10101000

1 > 00000001

254 > 11111110

 

192.168.1 > network portion of address

254 > host portion of address

 

Class	First octect	First octect numeric range
A	0xxx xxxx	0-127
B	10xx xxxx	128-191
C	110x xxxx	192-223
D (Multicast addresses)	1110 xxxx	224-239
E (Reserved (experimental)	1111 xxxx	240-255

 

Loopback Addresses

-> Address range 127.0.0.0 - 127.255.255.255

 

Class	First octect	First octect numeric range	Prefix Length
A	0xxx xxxx	0-127	/8
B	10xx xxxx	128-191	/16
C	110x xxxx	192-223	/24

 

A class: Fewer networks, More hosts

C class: More networks, Fewer hosts

 

Netmask:

Class A: /8

255.0.0.0

11111111 00000000 00000000 00000000

 

* Host portion of the address is all 0's = Network Address (CANNOT be assigned as a host adr)

* Host portion of the address is all 1's = Broadcast Address (CANNOT be assigned as a host adr)