Free Excel IPv4 Subnet Calc – get it from the link in the description
Free IPv4 Excel Subnet Calculator Spreadsheet (xlsx) – Put in the IP address, set the subnet mask and see the Subnet Address, Broadcast Address, Number of Hosts, Wildcard Mask, Hex and Binary equivalents of the IP address. See if the range has public or private addresses or both, see problems with the range and what subnets are available.
https://www.dropbox.com/s/upjomcvbkc5b5k6/Techiedoodah-ipv4-subnet-calc-v1.1.xlsx?dl=1
ipv4
