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working on small LAN for a office, going to use windows server 2012 with AD which ip range is suitable for this. there's like 13pc's & 1 server

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  • Did any answer help you? if so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you could provide and accept your own answer.
    – Ron Maupin
    Aug 7 '17 at 18:41
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Any of the private address ranges are acceptable:

10.0.0.0/8
172.16.0.0/12
192.168.0.0/16

Which you choose is up to you since any are larger than you need right now, but you may want to think about future growth, too.

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  • in future there's only be like 10-20 pc's more. is it necessary to subnet even my network is a small one? Jan 23 '16 at 3:51
  • You probably want to pick a much larger size. Many people use /24 as the default since it is easier for them, and it is a reasonable size for a VLAN. Just understand that you should be thinking about the future where you could be 10 times your predicted size. That is one of the biggest mistakes companies seem to make, and the choices you make now can have big consequences in the future. If you wait until it gets out of hand, then you must reconfigure everything.
    – Ron Maupin
    Jan 23 '16 at 3:56
  • i see, so what will be you personal choice for a basic LAN? this network i am implementing for a web development firm Jan 23 '16 at 4:11
  • You could pick a /24 as your basic VLAN size. The 192.168.0.0/16 is fairly limited (256 VLANs) with that size. I would personally use the 10.0.0.0/8 and start with /24 VLANs, and there is plenty of room for bigger VLANs if you end up with something like a data center in the future. It's no fun having to manually re-address statically addressed devices like servers and printers, even if there are only a few, and get everyone to point to the new addresses.
    – Ron Maupin
    Jan 23 '16 at 4:18
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As Ron Maupin already mentioned, anything in those three ranges defined in RFC1918 will be fine, those are assigned for local networks.

Personally, I wouldn't pick one of the more obvious ranges like 192.168.0.0/24 or 10.0.0.0/24 if you ever plan to offer services like VPN for remote workers. Most of the home routers use those by default for their local networks, so it can be wise to stay clear of ranges to prevent an overlap.

I'd pick a range from the 172.16.0.0/12 network (which seems to be less used in home routers), and not the first /24, so for example 172.31.0.0/24.

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