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Fixed tabbing
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@janagyjr
janagyjr committed Nov 7, 2021
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40 changes: 20 additions & 20 deletions example subnetting problem.txt
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How To Use This File

This document illustrates the easiest way to figure out your subnets that I've yet seen.
This document illustrates the easiest way to figure out your subnets that I've yet seen.

IP Address
First, you need to convert your ip address into binary.
Expand All @@ -15,33 +15,33 @@ First Host
Your first host is the first IP address after the network ID (see the example problem below).

Last Host
Your last host is the IP address just before the broadcast address.
Your last host is the IP address just before the broadcast address.

Broadcast
Your broadcast address is related to your subnet mask and network ID. Whatever columns had zero in them in your subnet mask are converted to 1s for your broadcast address. Your broadcast address is going to be in your network block so it will look similar to what is in the example below. Your Broadcast address is your network ID with all the host bits converted to 1s

Example Problem:
IP 31.203.5.236/19
00011111.11001011.00000101.11101100 IP 31.203.5.236
11111111.11111111.11100000.00000000 subnet 255.255.224.0
00011111.11001011.00000000.00000000 network id 31.203.0.0
00011111.11001011.00000000.00000001 First host 31.203.0.1
00011111.11001011.00011111.11111110 Last Host 31.203.31.254
00011111.11001011.00011111.11111111 Broadcast 31.203.31.255
00011111.11001011.00000101.11101100 IP 31.203.5.236
11111111.11111111.11100000.00000000 subnet 255.255.224.0
00011111.11001011.00000000.00000000 network id 31.203.0.0
00011111.11001011.00000000.00000001 First host 31.203.0.1
00011111.11001011.00011111.11111110 Last Host 31.203.31.254
00011111.11001011.00011111.11111111 Broadcast 31.203.31.255

Example:
178.205.3.157/17
10110010.11001101.00000011.00101110 IP 178.205.3.157
11111111.11111111.10000000.00000000 subnet 255.255.128.0
10110010.11001101.00000000.00000000 network id 178.205.0.0
10110010.11001101.00000000.00000001 first host 178.205.0.1
10110010.11001101.01111111.11111110 last host 178.205.127.254
10110010.11001101.01111111.11111111 broadcast 178.205.127.255
10110010.11001101.00000011.00101110 IP 178.205.3.157
11111111.11111111.10000000.00000000 subnet 255.255.128.0
10110010.11001101.00000000.00000000 network id 178.205.0.0
10110010.11001101.00000000.00000001 first host 178.205.0.1
10110010.11001101.01111111.11111110 last host 178.205.127.254
10110010.11001101.01111111.11111111 broadcast 178.205.127.255

173.32.2.62/27
10101101.00100000.00000010.00101010 IP 173.32.2.62
11111111.11111111.11111111.11100000 Subnet 255.255.255.224
10101101.00100000.00000010.00100000 Network ID 173.32.2.32
10101101.00100000.00000010.00100001 First Host 173.32.2.33
10101101.00100000.00000010.00111110 Last Host 173.32.2.62
10101101.00100000.00000010.00111111 Broadcast 173.32.2.63
10101101.00100000.00000010.00101010 IP 173.32.2.62
11111111.11111111.11111111.11100000 Subnet 255.255.255.224
10101101.00100000.00000010.00100000 Network ID 173.32.2.32
10101101.00100000.00000010.00100001 First Host 173.32.2.33
10101101.00100000.00000010.00111110 Last Host 173.32.2.62
10101101.00100000.00000010.00111111 Broadcast 173.32.2.63

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