BINARY DIGITS CONVERTION
►
Determine the value of the octet by adding the values of positions wherever there
is a binary 1 presents.
►
If the is a 0 in a position, do not add the value.
►
If all 8 bits are 0 [ 00000000 ] the value of the octet is 0.
►
If all 8 bits are is , 111111111 the value of the octet is 255 (
128+64+32+16+8+4+2+1 ).
►
If the 8 bits are mixed, such as the example 00100111, the value of the octet
is 39 [ 32+4+1].
►
So the value of each of the four octets can range from 0 to a maximum of 255.
Address Class
|
1st Octet range
(decimal)
|
1st Octet bits (green bits
don’t change)
|
Network (N) Host (H) Parts of an
address
|
Default Subnet mask (Decimal and
Binary)
|
Numbers of possible networks and host
per network.
|
A
|
1-127
|
00000000-01111111
|
N.H.H.H
|
255.0.0.0
11111111.00000000.
00000000.00000000
|
126 nets (2^7-2) 16.777.214 hosts per
net (2^24-2)
|
B
|
128-191
|
10000000- 10111111
|
N.N.H.H
|
255.255.0.0
11111111.11111111.
00000000.00000000
|
16 382 nets (2^114-2) 65.534 hosts per
net (2^16-2)
|
C
|
192-223
|
10000000-11011111
|
N.N.N.H
|
255.255.255.0
11111111.11111111.
11111111.00000000
|
2.097.150 nets (2^21-1) 254 hosts per
net (2^8-2)
|
D
|
224-239
|
11100000-11101111
|
Not for commercial use as a host
|
||
E
|
240-255
|
11110000-11111111
|
Not for commercial use as a host
|
Tiada ulasan:
Catat Ulasan