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Im trying to set up a subnet address range in my local network but the private address ranges of 

172.16.1.1
192.168.1.1
10.1.10.1

are all already being used.

So I was wondering, if I make this subnet 172.17.1.1, will it be totally isolated from 172.16.1.1? and can I use both subnets without any problems? The subnet Im making now will also be a vlan.

Im just worried because I think I read somewhere that the first part of the ip address ranges cannot be the same.

thanks in advance.

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    The octets mean nothing. You cannot tell if they overlap without knowing the mask length of each. This two-part answer explains it all.
    – Ron Maupin ♦
    Jul 18, 2019 at 20:59

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It will depend on the subnet mask of the 172.16.1.0 network. If it is a /16 or longer, then 172.17.1 will fall outside the range and be fine to use

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  • so their subnet masks cant be the same?
    – user59250
    Jul 18, 2019 at 20:48
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    @user59250 Their masks can be the same as long as they're /16 (255.255.0.0) or longer (like /24 255.255.255.0). If they're shorter than /16, they will overlap and will not be segregated.
    – Jesse P.
    Jul 18, 2019 at 21:44

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