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The Essential Subnetting Cheat Sheet
October 28, 2015 | Views: 27437
While studying for CCNA many years ago, I created this document to assist me with subnetting. Hope you find this information helpful.
Address Space – 32 bit IPV4
|
11111111 |
11111111 |
11111111 |
11111111 |
Address Grid
|
28-2=254 |
27-2=126 |
26-2=62 |
25-2=30 |
24-2=14 |
23-2=6 |
22-2=4 |
21-2=0 |
|
128 |
64 |
32 |
16 |
8 |
4 |
2 |
1 |
|
1 = 128/25 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
1 |
1=192/26 |
0 |
0 |
0 |
0 |
0 |
0 |
|
1 |
1 |
1=224/27 |
0 |
0 |
0 |
0 |
0 |
|
1 |
1 |
1 |
1=240/28 |
0 |
0 |
0 |
0 |
|
1 |
1 |
1 |
1 |
1=248/29 |
0 |
0 |
0 |
|
1 |
1 |
1 |
1 |
1 |
1=252/30 |
0 |
0 |
|
1 |
1 |
1 |
1 |
1 |
1 |
1=254/32 |
0 |
|
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1=255 |
Step 1 – Draw Grid
Step 2 – Count on fingers by 2 from 2 (2,4,8,16,32,64,128,256)
Step3 – 2n-2
Step4 – “Can I draw the line here?”
Step5 – Magic number sequence (bit * wire number)
|
N |
128 |
64 |
32 |
16 |
8 |
4 |
2 |
1 |
|
1xN |
1 – 128 |
1 – 64 |
1 – 32 |
1 – 16 |
1 – 8 |
1 – 4 |
1 – 2 |
1 – 1 |
|
2xN |
2 – 256 |
2 – 128 |
2 – 64 |
2 – 32 |
2 – 16 |
2 – 8 |
2 – 4 |
2 – 2 |
|
3xN |
|
3 – 192 |
3 – 96 |
3 – 48 |
3 – 24 |
3 – 12 |
3 – 6 |
3 – 3 |
|
4xN |
|
4 – 256 |
4 – 128 |
4 – 64 |
4 – 32 |
4 – 16 |
4 – 8 |
4 – 4 |
|
5xN |
|
|
5 – 160 |
5 – 80 |
5 – 40 |
5 – 20 |
5 – 10 |
5 – 5 |
|
6xN |
|
|
6 – 192 |
6 – 96 |
6 – 48 |
6 – 24 |
6 – 12 |
6 – 6 |
|
7xN |
|
|
7 – 224 |
7 – 112 |
7 – 56 |
7 – 28 |
7 – 14 |
7 – 7 |
|
|
|
|
8 – 256 |
Up to 16 |
Up to 32 |
Up to 64 |
Up to 128 |
Up to 256? |
|
Class |
IP Range |
Subnet |
Private Address Range |
|
Class A |
1 – 126 |
255.0.0.0 |
10.0.0.0 – 10.255.255.255.255 |
|
Class B |
128 – 191 |
255.255.0.0 |
172.16.0.0 – 172.31.255.255 |
|
Class C |
192 – 223 |
255.255.255.0 |
192.168.0.0 – 192.168.255.255 |
|
Class D |
224 – 239 |
Multicast |
|
|
Class E |
240 – 255 |
Experimental |
|
|
OSI Model |
TCP/IP Model |
TCP/IP Protocols |
|
Application |
Application |
HTTP, SMTP, POP3 |
|
Presentation |
||
|
Session |
||
|
Transport |
Transport (TCP/UDP |
TCP, UDP |
|
Network |
Internet (IP) |
IP |
|
Data – Link |
Network Access Layer (Ethernet/FDDI) |
Ethernet, Frame-Relay, PPP |
|
Physical |
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Excellent information, thank for sharing!
I am studying for the CCNA. I get subnetting, but I do not understand this sheet exactly. Wish I could as it would probably help speed it up.