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Subnet Calculator

IP [A] IP [B]
Subnet Mask [C]
Subnet Minimum Subnet Maximum
  • Place IPs from a range into A and B, [TAB] away or hit [ENTER] and the other fields will update show the minimal subnet required for both.
  • The subnet may be changed manually by editing the middle fields. The reference IP for any subnet changes is IP [A].
  • Magic happens if a subnet /xx reference is included in A or B.
  • Magic also happens if a negative number is entered in A, B or C.
  • The [v] buttons copy their respective IPs into the formatter below.

IP Formatter

IP in 4   . . .    
Oct in 4   . . .    
Hex in 4   . . .    
  • Change any field and [TAB] away or hit [ENTER] to update the others
  • Buttons A, B and C copy the IP field to the relevant field in the subnet form.


This site should work with most browsers
though there are some advanced features
that will only work with more recent software
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