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Please help me answer this networking question

netaware
Level 1
Level 1

A company has been allocated the address range 187.11.0.0 to 187.27.255.255

 

What is the network (supernet) address and what is the (supernet) mask?

 

(Hint: You might want to convert them into binary and calculate the common bits)

 

 

 

1 Accepted Solution

Accepted Solutions

Seb Rupik
VIP Alumni
VIP Alumni

Hi there,

The range 187.11.0.0 to 187.27.255.255 is a component of the supernet 187.0.0.0 /11 (supermask: 255.224.0.0)

 

https://www.calculator.net/ip-subnet-calculator.html?cclass=any&csubnet=11&cip=187.11.0.0&ctype=ipv4&printit=0&x=102&y=20

 

cheers,

Seb.

View solution in original post

4 Replies 4

Seb Rupik
VIP Alumni
VIP Alumni

Hi there,

The range 187.11.0.0 to 187.27.255.255 is a component of the supernet 187.0.0.0 /11 (supermask: 255.224.0.0)

 

https://www.calculator.net/ip-subnet-calculator.html?cclass=any&csubnet=11&cip=187.11.0.0&ctype=ipv4&printit=0&x=102&y=20

 

cheers,

Seb.

I am not clear where that question comes from and whether there is any more to it than just working out the subnetting bits. @Seb Rupik is quite correct in his answer about the supernet. But I wonder if there might be more to the discussion than just working out the subnetting bits. The question states that a company has been allocated this address range. My observations are that:

- this is a range of Public IP addresses, which suggests that the range was assigned by some service provider.

- it is a very awkward assignment and illustrates the implications of assigning address ranges that do not start on a bit boundary.

- attempts to summarize this address range, which a company would likely want to do, will result in a summary address that includes lots of IP addresses that are not part of the company's assigned address space.

- if this question were to be part of a larger exercise that asked for dynamic routing of the address space, or asked for implementation of security policies for the address space that would become quite complicated.

HTH

Rick

Thanks for the help, that makes more sense.

 

Joseph W. Doherty
Hall of Fame
Hall of Fame

No one summary covers that address range.  However, the following summaries would:

187.11.0.0/16
187.12.0.0/14
187.16.0.0/13
187.24.0.0/14

 

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