Markdown Editor
Write Markdown and see it as you type, with GitHub alerts, tables, tasks, math, Mermaid and PlantUML.
Subnet Calculator
Type a range to see its addresses and mask bit by bit, how it splits, how your subnets fit in it, and whether another range overlaps it.
Takes10.20.5.7/1610.20.0.0 255.255.0.010.20.0.0 - 10.20.3.2552001:db8::/48
That's not an IPv4 or IPv6 range: try 10.20.0.0/16 or 2001:db8::/48.
The 32 bits
Usable in
Split itinto
| # | Subnet | Usable | Hosts |
|---|
Plan your subnets
Each one's name and the hosts it needs: it gets the smallest block that fits, the biggest placed first so nothing is lost to alignment.
NameHosts
| Name | Subnet | Usable | Room |
|---|
Does it fit?
An address or a range: is it inside, does it overlap? (A peering, a VPN, another VNet.)
Usable hosts depend on where the subnet lives. On any network the first address (the network) and the last (the broadcast) are kept; Azure and AWS keep the first four and the last, Google Cloud the first two and the last two. Azure and Google Cloud take subnets down to a /29, AWS from a /16 to a /28.
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