DX-VS1UE User’s Manual
43
According to masking point, masked network ID is to be different out of the same IP address. For ex-
ample, if IP address is described as 192.168.1.13 (11000000.10101000.00000001.00001101) with
masking point 24 (255.255.255.0), the IP addresses whose IP address is consisted with
‘11000000.10101000.00000001.xxxxxxxx’ (2
8
(256) pieces of IP addresses) will be allowed or de-
nied from DX-VS1UE.
If you describe an IP address as 192.168.1.13 and put masking point 26 (255.255.255.192), the mas
ked bits are the first 26 digits and network ID masked as ‘11000000.10101000.00000001.00’. In thi
s case, the IP addresses whose IP address is consisted with ‘11000000.10101000.00000001.00xxxxx
x’ (2
6
(64) pieces of IP addresses) will be applied with a command of ‘Allow’ or ‘Deny’.
Though masking point is to be any bit out of 32 bits, it is common to point on the bits of host ID part.
If the masking point is placed on network ID part, the range is expanded compared to the provided IP
address.
Network class is divided as follows. D and E class networks are not to be used by normal user.
Class
Decimal number of X1 byte
Network ID
Host ID
A
0 to 127
X1
X2, X3, X4
B
128 to 191
X1, X2
X3, X4
C
192 to 223
X1, X2, X3
X4
D
224 to 239
For Multicasting utilization
E
240 to 255
Reserved for specific utilization
In C class network, the applied number of IP addresses with network masking is as below when you
Network masking point (0 to 31)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 0
E.g. Network masking on the 8
th
bit (8): 11111111. 0000000. 00000000. 00000000 (255.0.0.0)
E.g. Network masking on the 16
th
bit (16): 11111111. 11111111. 00000000. 00000000 (255.255.0.0)
E.g. Network masking on the 24
th
bit (24): 11111111. 11111111. 11111111. 00000000 (255.255.255.0)
E.g. Network masking on the 32
nd
bit (0): 11111111. 11111111. 11111111. 11111111 (255.255.255.255)
Applied IP address number according to masking point
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 0
2
31
2
30
2
29
2
28
2
27
2
26
2
25
2
24
2
23
2
22
2
21
2
20
2
19
2
18
2
17
2
16
2
15
2
14
2
13
2
12
2
11
2
10
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
E.g. Masking point 8: 2
24
pieces of IP addresses are applied
E.g. Masking point 16: 2
16
pieces of IP addresses are applied
E.g. Masking point 24: 2
8
pieces of IP addresses are applied
E.g. Masking point 0: 2
0
pieces of IP address (itself) is applied
ENGLISH
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