IP Range Expander
Turn a CIDR block or a start–end IP range into the full list of addresses, or just count them — IPv4 and IPv6. Runs entirely in your browser, no server, no sign-up.
What this tool does
Expand a CIDR block or a start–end IP range into the full list of addresses it covers — or just count them. Works for both IPv4 and IPv6, runs entirely in your browser (nothing is sent to a server), works offline, and needs no sign-up. Paste a range, pick Output, and copy the result.
Accepted input
| Form | Example | Expands to |
|---|---|---|
| CIDR | 192.168.1.0/24 | 192.168.1.0 … 192.168.1.255 |
| CIDR (IPv6) | 2001:db8::/126 | 2001:db8:: … 2001:db8::3 |
| Range | 192.168.1.10-192.168.1.20 | 192.168.1.10 … 192.168.1.20 |
| Range (IPv6) | 2001:db8::1-2001:db8::5 | 2001:db8::1 … 2001:db8::5 |
| Range (short end) | 192.168.1.10-12 | 192.168.1.10, .11, .12 |
A CIDR expands the whole block, including the network and broadcast
addresses. A non-aligned base is normalized to its network address first, so
192.168.1.130/29 expands the 192.168.1.128–192.168.1.135 block.
Output
- List — every address in the range, one per line.
- Count — just the total number of addresses. This is exact and unbounded,
so it works even for an IPv6
/64(18 446 744 073 709 551 616 addresses) or a whole/0.
Max addresses to list
To keep things fast, List mode stops if a range has more than the limit you
set (default 65536, which is a /16). If your range is bigger, the tool
tells you exactly how many addresses it has — raise the limit, narrow the range,
or switch the Output to Count.
Examples
| Input | Output | Result |
|---|---|---|
10.0.0.0/30 | List | 10.0.0.0, 10.0.0.1, 10.0.0.2, 10.0.0.3 |
192.168.1.0/24 | Count | 256 |
10.0.0.1-10.0.0.5 | List | 10.0.0.1 … 10.0.0.5 |
2001:db8::/64 | Count | 18446744073709551616 |
FAQ
Does a CIDR include the network and broadcast addresses?
Yes — this tool
lists the entire block. 10.0.0.0/30 gives all four addresses, including
10.0.0.0 (network) and 10.0.0.3 (broadcast).
Does it support IPv6?
Yes. Give an IPv6 CIDR (2001:db8::/126) or an IPv6
range (2001:db8::1-2001:db8::5). Because IPv6 blocks can be astronomically
large, use Count for anything wider than a small prefix.
What if my range is huge?
List mode caps the number of addresses (so your browser doesn't try to render millions of lines). Use Count for the exact total of any size, or raise the limit for a slightly larger list.
Is it free and private?
Yes — your input never leaves your device, and the page keeps working offline once it has loaded.
Developer & Automation Access
Run it from the terminal
Same engine as this page, headless — via the gizza CLI:
gizza tool ip-range-expand "192.168.1.0/24 or 10.0.0.1-10.0.0.5"New to the CLI? Get gizza →
Open it by URL
Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:
https://gizza.ai/tools/ip-range-expand/?input=192.168.1.0%2F24%20%20or%20%2010.0.0.1-10.0.0.5&output=list&limit=65536Machine-readable descriptor: tool.json — title + parameters JSON Schema for agents.