| IP version | IPv4 |
| Range start (network) | 192.168.1.0 |
| Range end (broadcast) | 192.168.1.255 |
| Range | 192.168.1.0 – 192.168.1.255 |
| Total addresses | 256 |
| Usable hosts | 254 |
| Netmask | 255.255.255.0 |
| CIDR | /24 |
CIDR-to-range math runs entirely in your browser — nothing is uploaded.
Convert a CIDR block to its IP range, free. CIDR notation (RFC 4632) describes a block of IP addresses as a base address plus a prefix length, like 192.168.1.0/24 or 2001:db8::/48. This tool expands a CIDR block into its first (network) and last (broadcast) address, the full range, the total number of addresses and the usable host count — for both IPv4 and IPv6 — entirely in your browser.
It turns any IPv4 or IPv6 CIDR block into a concrete first-to-last IP range and an exact, BigInt-accurate address count, so you can define firewall rules, allow-lists and VPC ranges without manual bitwise math. 100% free, no registration, and complete privacy — everything runs locally in your browser, so your data never touches a server.
Expands a CIDR block to its network (first) and broadcast (last) address so you have the exact range bounds.
Counts every address in the block using BigInt, so even huge IPv6 ranges report an accurate total — not a rounded float.
Accepts both families: 192.168.0.0/22 or 2001:db8::/32. The prefix is validated against 0–32 (IPv4) or 0–128 (IPv6).
All parsing and math run locally in your browser; nothing you enter is uploaded, logged or stored.
Full IPv4 subnet breakdown
IPv4 to decimal, hex and binary
Normalize IPv6 addresses
It is every address from the network address (all host bits 0) to the broadcast address (all host bits 1). For 192.168.1.0/24 the range is 192.168.1.0 – 192.168.1.255, which is 256 addresses (254 usable hosts).
A /24 has 2^(32−24) = 256 total addresses. Two are reserved (network and broadcast), leaving 254 usable hosts. In general a /n holds 2^(32−n) addresses for IPv4.
Yes. Enter an IPv6 CIDR like 2001:db8::/48 and the tool reports the first and last address and the (often astronomically large) total count, computed exactly with BigInt.
A subnet calculator focuses on masks, wildcard masks and host math for a single subnet; this tool focuses on the concrete first-to-last IP range and total address count of a block — handy for allow-lists and firewall rules.
No. The conversion runs entirely in your browser; nothing you type leaves your device.
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