1. With 1124 hosts per subnet required 16.9.15.127 has a custom subnet mask of:

Question

1. With 1124 hosts per subnet required 16.9.15.127 has a custom subnet mask of:

2. With 124 hosts per subnet required 221.1.14.122 has a custom subnet mask of:

3. With 127 hosts per subnet required 129.75.75.75 has a custom subnet mask of:

4. With 12 hosts per subnet required 191.2.15.123 has a custom subnet mask of:

5. With 16,517 hosts per subnet required 16.17.25.221 has a custom subnet mask of:

6. With 175 hosts per subnet required 188.8.14.126 has a custom subnet mask of:

7. With 17 hosts per subnet required 214.5.11.123 has a custom subnet mask of:

8. With 2224 hosts per subnet required 6.7.13.125 has a custom subnet mask of:

9. With 224 hosts per subnet required 125.0.0.1 has a custom subnet mask of:

10. With 224 hosts per subnet required 3.2.13.121 has a custom subnet mask of:

11. With 234 hosts per subnet required 176.3.17.125 has a custom subnet mask of:

12. With 256 hosts per subnet required 116.5.19.127 has a custom subnet mask of:

13. With 30 hosts per subnet required 216.8.16.128 has a custom subnet mask of:

14. With 30 hosts per subnet required 219.3.16.124 has a custom subnet mask of:

15. With 37 hosts per subnet required 177.6.12.124 has a custom subnet mask of:

16. With 3 hosts per subnet required 22.6.5.5 has a custom subnet mask of:

17. With 4092 hosts per subnet required 105.27.32.123 has a custom subnet mask of:

18. With 62 hosts per subnet required 196.4.18.126 has a custom subnet mask of:

19. With 657 hosts per subnet required 2.6.18.128 has a custom subnet mask of:

20. Class B Addresses are reserved for experimental communications. T or F

Can you please show how to calc the custom subnet mask? Or a link to website to calculate and intruction how to do it in that website?

Explanation / Answer

here is one method i have found..

IP Subnetting Step 2: Determining The Custom Subnet Mask

Once we have decided how many bits to use for the subnet ID and how many to leave for the host ID, we can determine the custom subnet mask for our network. Now, don't go running for cover on me. J A lot of people's eyes glaze over at mention of the subnet mask, but it's really quite simple to figure out once we have done our homework in making the design decision we did in Step #2. In fact, there are two ways of doing this; one is less work than the other, but they're both quite easy. I was going to call them the “hard” way and the “easy” way, but instead, I'll call them “easy” and “easier”.

Calculating The Custom Subnet Mask

Let's start with the “easy” method, in which we determine the subnet mask in binary form from the information we already have about our network, and then convert the mask to decimal. To refresh your memory and guide the process, remember this: the subnet mask is a 32-bit binary number where a 1 represents each bit that is part of the network ID or subnet ID, and a 0 represents each bit of the host ID.

Class C Custom Subnet Mask Calculation Example

Refer back to the Class C example in the previous topic. We decided to use 3 bits for the subnet ID, leaving 5 bits for the host ID. Here are the steps we will follow to determine the custom subnet mask for this network (illustrated in Figure 76):

Figure 76: Determining The Custom Subnet Mask for A Class C Network

11111111 11111111 11111111 00000000

11111111 11111111 11111111 11100000

P Subnetting Step #3: Determining The Custom Subnet Mask
(Page 2 of 2)

Class B Custom Subnet Mask Calculation Example

Now, let's do the same example with our Class B network (166.113.0.0) with 5 bits for the subnet ID (with a bit less narration this time; see Figure 77):

Figure 77: Determining The Custom Subnet Mask for A Class B Network

11111111 11111111 00000000 00000000

11111111 11111111 11111000 00000000

Here are the two websites where you can caluculate custom subnet masks.

http://www.subnetmask.info/

http://www.t1shopper.com/tools/calculate/ip-subnet/

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