AV-W10
Subnet Calculator
Work out IPv4 and IPv6 network ranges, masks and host counts from CIDR notation, and split subnets.
● Runs on your device; nothing is uploadedHow to use it
- Type an Address / prefix, such as 192.168.1.0/24 or 2001:db8::/48.
- Drag the Prefix length slider to resize the block.
- Read the network, range, mask and host counts and copy any row.
- Set a New prefix length under Split into subnets to list smaller blocks.
- Type an IP address under Does it contain… to test membership.
Limits
- Prefix length
- 0–32 (IPv4), 0–128 (IPv6)
- Subnets listed
- First 256 (full count always shown)
Features
- IPv4 and IPv6, including IPv4-mapped addresses
- Accepts an IPv4 dotted netmask in place of a prefix
- IPv4 /31 and /32 handled as fully usable (RFC 3021)
- Expanded and RFC 5952 compressed IPv6 forms
- Labels private, loopback, documentation and other special ranges
- Warns when the address has host bits set
For AI agents: avtools_subnet_calculator
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