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

are all already being used.

So I was wondering, if I make this subnet, will it be totally isolated from 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.

  • 2
    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

1 Answer 1


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

  • so their subnet masks cant be the same?
    – user59250
    Jul 18, 2019 at 20:48
  • 2
    @user59250 Their masks can be the same as long as they're /16 ( or longer (like /24 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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