Cheatography
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ADDRESS CLASS: A, B, C
Class: |
A |
B |
C |
Range |
0-127 |
128-191 |
192-223 |
N/H |
N.H.H.H |
N.N.H.H |
N.N.N.H |
Network Bits |
Nx8 = 8 |
Nx8 = 16 |
Nx8 = 24 |
Host Bits |
Hx8 = 24 |
Hx8 = 16 |
Hx8 = 8 |
# Addresses |
16,777,210 |
66,536 |
256 |
Private Range |
10.0.0.0 - 10.255.255.255 |
172.16.0.0 - 172.31.255.255 |
192.168.0.0 - 192.168.255.255 |
Subnet Mask |
255.0.0.0 |
255.255.0.0 |
255.255.255.0 |
ADDRESS CLASS: D & E
CLASS |
RANGE |
NOTE |
D |
224 - 239 |
reserved for multicasting |
E |
240 - 255 |
reserved for research & development |
Power of 2 table
2^0 |
1 |
2^8 |
256 |
2^1 |
2 |
2^9 |
512 |
2^2 |
4 |
2^10 |
1,024 |
2^3 |
8 |
2^11 |
2,048 |
2^4 |
16 |
2^12 |
4,096 |
2^5 |
32 |
2^13 |
8,192 |
2^6 |
64 |
2^14 |
16,384 |
2^7 |
128 |
2^15 |
32,768 |
BIT, VALUE, MASK
BIT |
VALUE |
N-BITS / H-BITS |
MASK |
1 |
128 |
1 / 7 |
10000000 |
2 |
192 |
2 / 6 |
11000000 |
3 |
224 |
3 / 6 |
11100000 |
4 |
240 |
4 / 4 |
11110000 |
5 |
248 |
5 / 3 |
11111000 |
6 |
252 |
6 / 2 |
11111100 |
7 |
254 |
7 / 1 |
11111110 |
8 |
255 |
8 / 0 |
11111111 |
SOME FORMULAS
# BLOCKS FOR LARGE #s |
2^H / 256 = # BLOCKS |
NUMBER OF SUBNETS = |
2^n ( n = Number of borrowed bits from host) |
NUMBER HOSTS PER SUBNET = |
(2^h - 2) ( h = Number of Host bits) |
Hosts have always been with the "-2" part. Because the network address and broadcast address have always been unusable for hosts.
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Comments
Thanks for building this cheat sheet for IP addressing. I have downloaded it to keep on hand.
Robert Bone- You are absolutely welcome! I created it to have handy for a GIAC exam. I'm glad it was useful for you as well.
Thank you Amanda for posting!
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