~/netref / Bulk Subnet Table
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Bulk Subnet Table

Paste a whole list of CIDRs (one per line — 10.0.0.0/24 or 10.0.0.0 24) and get the network, broadcast, mask, usable count and host range for every one at once — then copy the table as CSV or Markdown straight into a runbook or ticket.

CIDRs (one per line — accepts "10.0.0.0/24" or "10.0.0.0 24")
4 of 4 valid
CIDRNetworkBroadcastMaskUsableRange
10.0.0.0/2410.0.0.010.0.0.255255.255.255.025410.0.0.1 – 10.0.0.254
172.16.0.0/16172.16.0.0172.16.255.255255.255.0.065,534172.16.0.1 – 172.16.255.254
192.168.1.0/26192.168.1.0192.168.1.63255.255.255.19262192.168.1.1 – 192.168.1.62
10.1.2.0/2710.1.2.010.1.2.31255.255.255.2243010.1.2.1 – 10.1.2.30