IP Range Expander
Turn a CIDR block or a start-end range into the full list of addresses it covers.
Runs entirely in your browser.
Expand a CIDR Block or IP Range to a List
About IP Range Expander
Give a CIDR block such as 10.0.0.0/29, or a range such as 10.0.0.1-10.0.0.20, and every address in it is listed. Useful for filling in a firewall rule, an allow-list or a config file that will not take CIDR notation.
Large blocks are capped, because a /8 holds nearly 17 million addresses and no browser should try to print them. The count is always reported in full even when the list is truncated, so you can see what you asked for.
Other Networking Tools
- IP Subnet Calculator — masks, network and host ranges
- IP Address Converter — IPv4 to decimal, binary and hex
- IPv6 ULA Generator — a private RFC 4193 prefix
- MAC Address Generator — random addresses in any format
- MAC Address Lookup — vendor prefix and bit decoding
- URL Parser — break a URL into its parts
- HTTP Header Analyzer — explain response headers
