Subnetting Tutorial
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1
2Subnetting Tutorial....
Given 10.16.139.203 255.255. 224.0 , Find the following...
1) # Host Bits
13
2) # Valid Hosts
8190
3) Network IP
10.16.128.0
4) First Valid Host IP
10.16.128.1
5) Last Valid Host IP
10.16.159.254
6) Broadcast IP
10.16.159.255
Step 0: Convert subnet mask to prefix (slash notation) if necessary:
IP = 10.16.139.203 Prefix = /19 (Prefix = number network bits)
Step 1: Find the # of host bits:
# Host Bits = 32 - 19
=
13
(from Step 0)
Step 2: Find the # valid hosts:
13 (from step 1)
2
- 2 = 8192 - 2 =
8190
Step 3: Find the Network IP/ID:
To do this, we need to determine which octet we are subnetting in. Since this address is a /19,
rd
we are subnetting in the 3
octet. Now we need to convert the IP address to binary.
00001010 . 00010000 . 10001011 . 11001011
Since the first 19 bits are network bits, we cannot touch them. To find the Network IP, set all
the host bits (last 13) to 0
00001010 . 00010000 .
10000000 . 00000000
So the Network IP is
10.16.128.0
Step 4: Find the first valid host IP:
This is just 1 address past the Network IP
10.16.128.1
Step 5: Find the Broadcast IP:
Yea, I know, this should be last but it is easier to do it now...
To find the Broadcast IP, set all the host bits to 1 (similar to step 3)
00001010 . 00010000 .
10011111 . 111111111
So the Broadcast IP is
10.16.159.255
Step 6: Find the last valid host IP:
This the IP address just before the Broadcast,
10.16.159.254
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