In association with heise online  Subnet calculator  / more less
Inverse subnet mask: Network address: Host IPs from:  The subnet
calculator computes subnet masks, broadcast addresses or CIDR
suffixes from the remaining parameters which are required for a
TCP/IP subnet. In addition, it calculates the smallest common
subnet for two IP addresses.  Determine the smallest subnet
which contains both IP addresses:  Address of the network: CIDR
suffix: Subnet mask: Broadcast address:    • July's Community
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