D-Link DGS-3308FG Product Manual - Page 32

Classless InterDomain Routing - CIDR

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8-port Gigabit Ethernet Switch User's Guide Classless InterDomain Routing - CIDR Under CIDR, the subnet mask notation is reduced to a simplified shorthand. Instead of specifying all of the bits of the subnet mask, it is simply listed as the number of contiguous "1"s (bits) in the network portion of the address. Look at the subnet mask of the above example in binary - 11111111.11100000.00000000.00000000 - and you can see that there are 11 "1"s or 11 bits used to mask the network address from the node address. Written in CIDR notation this becomes: 10.32.0.0/11 # Subnet Mask CID # of # of Hosts of R Subnets Bit Not s atio n 2 255.192.0.0 /10 2 4194302 3 255.224.0.0 /11 6 2097150 4 255.240.0.0 /12 14 1048574 5 255.248.0.0 /13 30 524286 6 255.252.0.0 /14 62 262142 7 255.254.0.0 /15 126 131070 8 255.255.0.0 /16 254 65534 9 255.255.128.0 /17 510 32766 10 255.255.192.0 /18 1022 16382 11 255.255.224.0 /19 2046 8190 12 255.255.240.0 /20 4094 4094 13 255.255.248.0 /21 8190 2046 14 255.255.252.0 /22 16382 1022 15 255.255.254.0 /23 32766 510 16 255.255.255.0 /24 65534 254 17 255.255.255.128 /25 131070 126 18 255.255.255.192 /26 262142 62 19 255.255.255.224 /27 525286 30 20 255.255.255.240 /28 1048574 14 21 255.255.255.248 /29 2097150 6 22 255.255.255.252 /30 4194302 2 Total Hosts 8388604 12582900 14680036 15728580 16252804 16514820 16645636 16710660 16742404 16756740 16760836 16756740 16742404 16710660 16645636 16514820 16252804 15728580 14680036 12582900 8388604 Table 5-2. Class A Subnet Masks # of Subnet Mask Bits 2 255.255.192 3 255.255.224.0 4 255.255.240.0 5 255.255.248.0 6 255.255.252.0 7 255.255.254.0 8 255.255.255.0 9 255.255.255.12 8 10 255.255.255.19 2 11 255.255.255.22 4 12 255.255.255.24 0 13 255.255.255.24 8 14 255.255.255.25 CIDR Notatio n /18 /19 /20 /21 /22 /23 /24 /25 /26 /27 /28 /29 /30 # of Subnets 2 6 14 30 62 126 254 510 1022 2046 4094 8190 16382 # of Hosts 16382 8190 4094 2046 1022 510 254 126 62 30 14 6 2 Total Hosts 32764 49140 57316 61380 63364 64260 64516 64260 63364 61380 57316 49140 32764 22

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8-port Gigabit Ethernet Switch User’s Guide
22
Classless InterDomain Routing – CIDR
Under CIDR, the subnet mask notation is reduced to a simplified shorthand. Instead of specifying all of the bits of the
subnet mask, it is simply listed as the number of contiguous “1”s (bits) in the network portion of the address. Look at the
subnet mask of the above example in binary - 11111111.11100000.00000000.00000000 – and you can see that there are
11 “1”s or 11 bits used to mask the network address from the node address.
Written in CIDR notation this becomes:
10.32.0.0/11
#
of
Bit
s
Subnet Mask
CID
R
Not
atio
n
# of
Subnets
# of Hosts
Total Hosts
2
255.192.0.0
/10
2
4194302
8388604
3
255.224.0.0
/11
6
2097150
12582900
4
255.240.0.0
/12
14
1048574
14680036
5
255.248.0.0
/13
30
524286
15728580
6
255.252.0.0
/14
62
262142
16252804
7
255.254.0.0
/15
126
131070
16514820
8
255.255.0.0
/16
254
65534
16645636
9
255.255.128.0
/17
510
32766
16710660
10
255.255.192.0
/18
1022
16382
16742404
11
255.255.224.0
/19
2046
8190
16756740
12
255.255.240.0
/20
4094
4094
16760836
13
255.255.248.0
/21
8190
2046
16756740
14
255.255.252.0
/22
16382
1022
16742404
15
255.255.254.0
/23
32766
510
16710660
16
255.255.255.0
/24
65534
254
16645636
17
255.255.255.128
/25
131070
126
16514820
18
255.255.255.192
/26
262142
62
16252804
19
255.255.255.224
/27
525286
30
15728580
20
255.255.255.240
/28
1048574
14
14680036
21
255.255.255.248
/29
2097150
6
12582900
22
255.255.255.252
/30
4194302
2
8388604
Table 5-2.
Class A Subnet Masks
# of
Bits
Subnet Mask
CIDR
Notatio
n
# of
Subnets
# of
Hosts
Total
Hosts
2
255.255.192
/18
2
16382
32764
3
255.255.224.0
/19
6
8190
49140
4
255.255.240.0
/20
14
4094
57316
5
255.255.248.0
/21
30
2046
61380
6
255.255.252.0
/22
62
1022
63364
7
255.255.254.0
/23
126
510
64260
8
255.255.255.0
/24
254
254
64516
9
255.255.255.12
8
/25
510
126
64260
10
255.255.255.19
2
/26
1022
62
63364
11
255.255.255.22
4
/27
2046
30
61380
12
255.255.255.24
0
/28
4094
14
57316
13
255.255.255.24
8
/29
8190
6
49140
14
255.255.255.25
/30
16382
2
32764