CIDR Subnet Calculator
Calculate an IPv4 or IPv6 range, network size, and addresses from clear definitions, without a connection.
Such as 192.168.1.0/24, an address with a mask (10.0.0.0 255.255.0.0), or an IPv6 prefix.
Try:
Your result
Type a network to see its range.
How to use it
- Type the prefix.
- Read the network.
- Read the count.
Examples
- A /24192.168.1.0/24 192.168.1.0 192.168.1.255 254
- A /32192.168.1.1/32 192.168.1.1 192.168.1.1 1
- IPv6 /322001:db8::1/32 2001:db8::/32 79228162514264337593543950336
Tool details and privacy
Type an address and a prefix length. IPv4 lists the network, the last address, and a usable count. IPv6 lists the network and the size as a decimal.
Listing every address in a large prefix is not useful. The count is.
Options
- IPv4 /31 and /32 use the full size as the usable count.
- IPv6 does not list every address.
Limits
- A prefix without a length is refused.
- IPv6 shows a count, not a list.
- This does not scan the network.
Privacy
What you type stays in your browser. Nothing is uploaded or saved on the server.
Questions
Does this scan the network?
No.
What does 192.168.1.0/24 report?
192.168.1.0, 192.168.1.255, and 254.
Does /32 subtract two addresses?
No. The usable count is 1.
Is the prefix uploaded?
No.