Need to figure out a subnet.

I have a range of IP's a beginning and and end how can I figure out the subnet?
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Muhammad Farjad ArshadSystem EngineerCommented:
IP range is usually decided by the number of hosts you like to have in a subnet let suppose you need 30 hosts in a particular subnet then you will use which contains 30 hosts and move forward
WellingtonISAuthor Commented:
Well I understand that but I was given the range I'm just trying to figure out the subnet
Adelaido JimenezDevOpsCommented:
What about if you try the experts exchange tool.
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atlas_shudderedSr. Network EngineerCommented:
The network range will be between a /24 and a /27.

What is the default gateway for the IPs they have given you?
nociSoftware EngineerCommented:
/27 is the smallest subnet, /0 (the internet) the largest describing this network.
Coolie SheppardSystems EngineerCommented:
It'll be a /28 or

You can always use the following:

Enter in the ending IP address and change the CIDR and see what value the beginning and ending IP addresses falls in
nociSoftware EngineerCommented:
@coolie sheppard,   it really needs a /27... (/28 start @ 240 and end on 255) so 239 is still missing out.
atlas_shudderedSr. Network EngineerCommented:
Again, The network range will be between a /24 and a /27.  Scope is a Class C so mask will be nothing larger than /24.  Due to the range of the provided IP's, the mask cannot be larger than /27 as anything smaller will fall across the S/N boundary, so it cannot/will not be a /28.

It also does not have to be a /27.  The default gateway is going to tell a lot about the mask size.  Even better, the ISP.
nociSoftware EngineerCommented:
Search on address deleiverd this:
Your ISP obtained a /20 block and probably carved it into smaller blocks (class has nothing to do with /CIDR....)
If it is a class block it is /24...
at it's own it needs a /27 (at minimum blocksize) and can be as large as /20 within this ISP.  (then you would have the complete block...)
(after the  the / a smaller number means a more hosts).
Addresses after this range would not get routed to your ISP ans thus not to you.

NetRange: -
NetName:        AMERI-43
NetHandle:      NET-209-182-160-0-1
Parent:         NET209 (NET-209-0-0-0-0)
NetType:        Direct Assignment
OriginAS:       AS13628
RegDate:        2016-04-14
Updated:        2016-04-18
nociSoftware EngineerCommented:
/28 is not correct.   (that is 240-255, or 224-239)   it does not contain   both 239 & 254.
I have to agree with Noci and atlas_shuddered - WellingtonIS has marked as a solution, an answer that is demonstrably incorrect.

This cannot be a /28. / 28 (or mathematically, up to and including / 28) gives you: through inclusive

It excludes which WellingtonIS explicitly said must be included - refer to their question:

I have a range of IP's a beginning and and end how can I figure out the subnet?

For anyone reading this later - please disregard WellingtonIS, and do not follow the solution they have marked as correct.


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