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Subnetting Quick Reference: Increments Per Subnet

This document provides a quick reference for subnetting Class C and Class B IP addresses. It shows the bit values and number of bits used to indicate the subnet mask for different size subnets. It also lists the number of subnets, number of hosts per subnet, and default number of hosts that can be supported for each subnetting option.

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Mary B Snoddy
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106 views5 pages

Subnetting Quick Reference: Increments Per Subnet

This document provides a quick reference for subnetting Class C and Class B IP addresses. It shows the bit values and number of bits used to indicate the subnet mask for different size subnets. It also lists the number of subnets, number of hosts per subnet, and default number of hosts that can be supported for each subnetting option.

Uploaded by

Mary B Snoddy
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
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Subnetting Quick Reference

Class C Class C (192-223) (255.255.255.0 or / 24) High Order Bits = 110 Notes
Slash Value 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 32
Bit Value 255 255 255 128 64 32 16 8 4 2 1 Increments per subnet
# of Bits 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 All turned on

Decimal value Sum of the bits turned on.


borrowed 128 192 224 240 248 252 254 255 Also called the subnet mask
2^n-2 where n = number of
# of Subnets 0 2 6 14 30 62 126 254 bits borrowed.

Number of hosts/subnet =
# of hosts per 2^n-2. n=total zeros to the

126

62

30

14
subnet right.

-2
6

0
2,097,152
default networks Network ID (24 bits) plus borrowed bits Host ID (8 bits) minus borrowed bits 254 default hosts

Class B Class B (128-191) (255.255.0.0 or /16) High Order Bits = 10


Slash Value 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 32
Bit Value 255 255 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 Increments per subnet
# of Bits 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 All turned on

Decimal value Sum of the bits turned on.


borrowed 128 192 224 240 248 252 254 255 128 192 224 240 248 252 254 255 Also called the subnet mask

16382

32766

65534
1022

2046

4094

8190
2^n-2 where n = number of

126

254

510
14

30

62
# of Subnets bits borrowed.

6
Number of hosts/subnet =
32766

16382

8190

4094

2046

1022
# of hosts per 2^n-2. n=total zeros to the

510

254

126

62

30

14
subnet right.

-2
6

0
16,384 default
networks Network ID (16 bits) plus borrowed bits Host ID (16 bits) minus borrowed bits 65,534 default hosts

Class A Class A (1-127) (255.0.0.0 or /8) High Order Bits = 0


Slash Value 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 32
Bit Value 255 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 Increments per subnet
# of Bits 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 All turned on

Decimal value Sum of the bits turned on.


borrowed 128 192 224 240 248 252 254 255 128 192 224 240 248 252 254 255 128 192 224 240 248 252 254 255 Also called the subnet mask

16777214
1048574

2097150

4194302

8388606
131070

262142

524286
16382

32766

65534
1022

2046

4094

8190

2^n-2 where n = number of


126

254

510
14

30

62

# of Subnets bits borrowed.


0

6
8388606

4194302

2097150

1048574

524286

262142

131070

Number of hosts/subnet =
65534

32766

16382

8190

4094

2046

1022

# of hosts per 2^n-2. n=total zeros to the


510

254

126

62

30

14
subnet right.

-2
6

0
127default Network ID (8 bits) plus
networks borrowed bits Host ID (24 bits) minus borrowed bits 16,777,214 default hosts

12/08/2021
Class C Class C (192-223) 255.255.255.0 High Order Bits = 110
Bit Value 255 255 255 128 64 32 16 8 4 2 1
# of Bits 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Decimal value
borrowed 128 192 224 240 248 252 254 255

# of Subnets 0 2 6 14 30 62 126 254

126

62

30

14
# of hosts per subnet

-2
6

0
2,097,152 default
networks Network ID (24 bits) Host ID (8 bits)

210.195.7.0
210.195.7.32
210.195.7.64
210.195.7.96
210.195.7.128
210.195.7.160
210.195.7.192
Notes
Increments per subnet
All turned on

Sum of the bits turned on.


Also called the subnet
mask

2^n-2 where n = number


of bits borrowed.

Number of hosts/subnet =
2^n-2. n=total zeros to
the right.

254 default hosts


Class A Class A (1-127) 255.0.0.0 High Order Bits = 0
Bit Value 255 128 64 32 16 8 4 2 1 128 64 32 16 8 4 2 1 128 64 32
# of Bits 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Decimal value
borrowed 128 192 224 240 248 252 254 255 128 192 224 240 248 252 254 255 128 192 224

131070

262142

524286
16382

32766

65534
1022

2046

4094

8190
126

254

510
14

30

62
# of Subnets

6
8388606

4194302

2097150

1048574

524286

262142

131070

65534

32766

16382

8190

4094

2046

1022
# of hosts per

510

254

126

62

30
subnet

127default
networks Network ID (16 bits) Host ID (16 bits)

5.0.0.0 5.15.255.255
5.16.0.0
5.32.0.0
5.48.0.0
5.64.0.0
16 8 4 2 1 Increments per subnet
1 1 1 1 1 All turned on

Sum of the bits turned on.


240 248 252 254 255 Also called the subnet mask

16777214
1048574

2097150

4194302

8388606

2^n-2 where n = number of


bits borrowed.

Number of hosts/subnet =
2^n-2. n=total zeros to the
14

right.
-2
6

16,777,214 default hosts

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