Determine subnet from IP

My company uses IP scheme of 10.10.x.x and we segragate servers to 10.10..2.x, printers to 10.10..4.x, workstations to 10.10.20.x, etc.

I was asked how many subnets that we have.

Am I correct that we have only one?  The second '10' in 10.10.x.x is our subnet?
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mcnuttlawAsked:
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tankergoblinCommented:
if you use subnet mask 255.255.0.0 then yes you have one subnet.
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Zephyr ICTCloud ArchitectCommented:
If you open a cmd window on your Windows desktop or server and type "ipconfig /all" you should see your subnetmask, that would be easier to tell you what your subnet is...

From the information you gave us it seems to be a big subnet, maybe you're using a 10.10.0.0/16 subnet, which allows for 65.536 hosts...

To know more about hosts, subnets and the CIDR notation, look here
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mcnuttlawAuthor Commented:
I forgot to mention that we have three remote offices:

172.16.x.x / 255.255.255.0
172.21.x.x / 255.255.255.0
192.168.x.x / 255.255.255.0

So does this mean that we have four subnets?
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tankergoblinCommented:
yes. in this case you have 4 subnet.
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Zephyr ICTCloud ArchitectCommented:
Yes, 4 subnets, the 3 remote ones are /24, the other one is most likely a /16
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
The question is: what is the asker after by wanting to know how many subnets you have? The info itself does not tell anything, and it often is more important which subnet masks and different networks you have in use.
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tankergoblinCommented:
i disagree, how many subnet do tell something. it tell asker that you seperate your network to 4 sub network where you need some sort of trust in order for them to communicate with each other.
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David Johnson, CD, MVPOwnerCommented:
What has been presented before is only the MINIMUM # of subnets, you could have considerably more all depending upon the netmask(s)  if the netmask is 255.255.0.0 for HQ and 255.255.255.0 for the branch offices then yes you have 4. Check your dhcp servers for the netmasks and also each statically defined computer (normally set as reserved address in dhcp)
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