How to Find a Network IP Address
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Based on OS:
- Windows: Start --> Type "CMD" in search field --> open command prompt --> type "ipconfig /all" --> look at and note the computers IP address and Subnet Mask
- Mac: Applications --> Utilities --> Terminal --> at prompt, type "ifconfig -a" --> look at and note inet address (aka IP address) and netmask (aka Subnet Mask - given in HEX (ex: 0xFFFFFF00) Conversion - Tip 1)
Based on your IP address and subnet mask, we can determine what subnet we are in, including the Net ID, Broadcast Address, and range of assignable IP's.
- Begin by determining the of subnets that are present. This is accomplished by using your subnet mask. The formula is: 2^n (where n = # of network bits used less the default for that range) Tip #2. Example: IP - 192.168.3.52; Subnet Mask - 255.255.255.128.
- Default subnet mask based on first octet (192) is 255.255.255.0 (or CIDR /24)
- The "128" in the last octet tells us that one additional network bit is used beyond default. Tip #3.
- Plug values into formula (using CIDR). Example: 25 - 24 = 1. 2^n = 2^1 = 2 = 2 subnets.
Now that the number of subnets has been determined (as per above example), we will have to determine which of the two subnets our IP address falls into.
- The first three octets of the IP will not change; leaving us with 2 Net ID's: 192.168.3.0 and 192.168.3.128. Tip #4
- By looking at the value of the fourth octet, we see that 52 falls between 0 and 127, thereby putting our IP in the first subnet with a Net ID of 192.168.3.0.
Lastly, note that we have established our Net ID, we can determine our first assignable IP, last assignable IP and broadcast address (Tip #5) for the example IP - 192.168.3.52; Subnet Mask 255.255.255.128.
- Network ID: 192.168.3.0
- First Assignable IP: 192.168.3.1
- Last Assignable IP: 192.168.3.126
- Broadcast IP: 192.168.3.127
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- Step 1 - Add decimals to HEX number0xFFFFFF00 = FF.FF.FF.00Step 2 - Assign decimal multiplier value to each position - in each octet First (left) position is 16, Second (right) position is 1. Step 3 - Multiply HEX value by positional multiplier, remembering that #10-15 are represented by letters A-F respectively.FF = 255 ((16*15)+(1*15))Step 4 - Perform action in step 3 for each octet to determine equivalent decimal number in subnet mask
- Default Subnet Ranges (based on first octet value). 0 through 127 = A (CIDR = /8). 128 through 191 = B (CIDR = /16). 192 through 223 = C (CIDR = /24). 224 through 239 = D (Multicast Addressing). 240 through 255 = E (Experimental)
- Decimal (subnet mask 4th octet) - CIDR equivalents. .128 = /25 .192 = /26 .224 = /27 .240 = /28 .248 = /29 .252 = /30 .254 = /31 .255 = /32
- A Net ID is the first IP address in a given subnet, and is not assignable to a host.
- A Broadcast IP is the last IP address in a given subnet, and is not assignable to a host.
Video: Calculate Network, Broadcast and host addresses
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Date: 12.12.2018, 05:16 / Views: 91381