Paste-first
Network
ready
IP Allowlist Builder
Normalize IPs, CIDR blocks, and ranges into copyable allowlists.
What IP Allowlist Builder does
local-first
IP Allowlist Builder normalizes pasted IP addresses, CIDR blocks, and start-end ranges into a compact allowlist. Use it for firewall notes, nginx allow directives, VPN reviews, and deployment checklists while keeping the data local in the browser.