How To Subnet In Your Head
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- Words: 389
- Pages: 2
How to subnet in your head. Subnet Patterns
Step One
Count
left to right
1
2
3
4
5
Step two Document Binary Place Value
6
7
8
Right to left
2^7 2^6 2^5 2^4 2^3 2^2 2^1 2^0 128
Step Three
64
32
16
8
4
2
1
left to right
ADD
128
Equals
128 192 224 240 248 252 254 255
Step Four
"+64" "+32" "+16" "+8"
"+4"
"+2"
"+1"
Close your eyes and Repeat steps 1-3
Range of Hosts
1
2
3
4
5
6
7
8
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
Bits Borrowed
Written by Daniel Foss http://ohiocatc.treca.org
Subnet Patterns
Page 1
How to subnet in your head. 1 Bit Borrowed
1
2
3
4
5
6
7
8
Range of Hosts
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
2 Bits Borrowed
1
2
3
4
5
6
7
8
Range of Hosts
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
3 Bits Borrowed
1
2
3
4
5
6
7
8
Range of Hosts
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
4 Bits Borrowed
1
2
3
4
5
6
7
8
Range of Hosts
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
5 Bits Borrowed
1
2
3
4
5
6
7
8
Range of Hosts
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
6 Bits Borrowed
1
2
3
4
5
6
7
8
Range of Hosts
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
7 Bits Borrowed
1
2
3
4
5
6
7
8
Range of Hosts
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
8 Bits Borrowed
1
2
3
4
5
6
7
8
Range of Hosts
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
Written By Daniel Foss http://ohiocatc.treca.org
Subnet Masks
4/4/01
Step One
Count
left to right
1
2
3
4
5
Step two Document Binary Place Value
6
7
8
Right to left
2^7 2^6 2^5 2^4 2^3 2^2 2^1 2^0 128
Step Three
64
32
16
8
4
2
1
left to right
ADD
128
Equals
128 192 224 240 248 252 254 255
Step Four
"+64" "+32" "+16" "+8"
"+4"
"+2"
"+1"
Close your eyes and Repeat steps 1-3
Range of Hosts
1
2
3
4
5
6
7
8
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
Bits Borrowed
Written by Daniel Foss http://ohiocatc.treca.org
Subnet Patterns
Page 1
How to subnet in your head. 1 Bit Borrowed
1
2
3
4
5
6
7
8
Range of Hosts
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
2 Bits Borrowed
1
2
3
4
5
6
7
8
Range of Hosts
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
3 Bits Borrowed
1
2
3
4
5
6
7
8
Range of Hosts
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
4 Bits Borrowed
1
2
3
4
5
6
7
8
Range of Hosts
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
5 Bits Borrowed
1
2
3
4
5
6
7
8
Range of Hosts
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
6 Bits Borrowed
1
2
3
4
5
6
7
8
Range of Hosts
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
7 Bits Borrowed
1
2
3
4
5
6
7
8
Range of Hosts
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
8 Bits Borrowed
1
2
3
4
5
6
7
8
Range of Hosts
128
64
32
16
8
4
2
1
Subnet Mask
128 192 224 240 248 252 254 255
Written By Daniel Foss http://ohiocatc.treca.org
Subnet Masks
4/4/01
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