Combination Ip-Address And Default Subnet Mask - TR-Electronic MP-Series Benutzerhandbuch

11.4.4 Combination IP-Address and Default Subnet mask

There is an declaration regarding the assignment of IP-address ranges and so-called
"Default Subnet masks". The first decimal number of the IP-Address (from left)
determines the structure of the Default Subnet mask regarding the number of "1"
values (binary) as follows:
Net address range (dec.)
1.0.0.0 - 126.0.0.0
128.1.0.0 - 191.254.0.0
192.0.1.0 - 223.255.254.0
Class A-Net: 1 Byte Net address, 3 Byte Host address
Class B-Net: 2 Byte Net address, 2 Byte Host address
Class C-Net: 3 Byte Net address, 1 Byte Host address
Example Subnet mask
IP-Address = 130.094.122.195,
Net mask = 255.255.255.224
Decimal
IP-Address 130.094.122.195
Net mask 255.255.255.224
Net address 130.094.122.192
IP-Address 130.094.122.195
Net mask 255.255.255.224
Host address
Printed in the Federal Republic of Germany
06/06/2019
IP-Address (bin.)
0xxx xxxx xxxx xxxx
10xx xxxx
xxxx xxxx
110x xxxx xxxx xxxx
10000010 01011110 01111010 11000011
11111111 11111111 11111111
10000010 01011110 01111010
10000010 01011110 01111010 11000011
11111111 11111111 11111111
(00000000 00000000 00000000 00011111)
00000000 00000000 00000000
3
TR - EMO - BA - DGB - 0019 - 08
xxxx xxxx xxxx xxxx
xxxx xxxx xxxx xxxx
xxxx xxxx xxxx xxxx
Binary
11100000
11000000
11100000
00000011
Address Default
Class Subnet mask
A 255.0.0.0
B 255.255.0.0
C 255.255.255.0
Calculation
IP-Address
AND Net mask
= Net address
IP-Address
AND (NOT Net mask)
= Host address
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