# IPv4 Range Expander

URL: https://phishdestroy.io/developer-tools/ipv4-range-expander
Category: General dev
Where it runs: Runs locally (nothing you enter is uploaded)

List every address in a CIDR block or between two IPv4 addresses, for example to turn the network range of a phishing host into a blocklist or an IOC list.

## Example input

TEST-NET-1 /28

```
192.0.2.0/28
```

16 addresses from 192.0.2.0 to 192.0.2.15, including the network and broadcast addresses.

## FAQ

### What input formats work?

A CIDR block in the first field, such as 192.0.2.0/28 (host bits are cleared, so 192.0.2.77/30 gives .76 to .79), or a start address in the first field and an end address in the second. Every address in the range is listed, including network and broadcast addresses.

### Is there a size limit or input check?

Ranges are limited to 1,024 addresses, the size of a /22. Octets are not validated, so a typo such as 999.1.1.1 produces a wrong address instead of an error, and /0 is treated as a single address.

### Is anything sent or scanned?

No. The list is calculated in your browser; no address is contacted and nothing is uploaded.

## Related tools

- [CIDR / Subnet Calculator](https://phishdestroy.io/developer-tools/cidr-subnet-calculator)
- [IPv4 Address Converter](https://phishdestroy.io/developer-tools/ip-address-converter)
- [Abuse Contact Lookup](https://phishdestroy.io/developer-tools/abuse-contact-lookup)
- [IOC Converter](https://phishdestroy.io/developer-tools/ioc-converter)
- [ASN Ranges Reference](https://phishdestroy.io/developer-tools/asn-reference)

All tools: https://phishdestroy.io/developer-tools