@chainsafe/netmask/src/index.ts

Typescript implementation of netmask filtering

import { IpNet } from "./ipnet.js";

export { ipToString } from "./util.js";
export { maskIp, iPv4FromIPv6, isIPv4mappedIPv6 } from "./ip.js";
export { IpNet } from "./ipnet.js";
export { parseCidr } from "./cidr.js";

/**
 * Checks if cidr block contains ip address
 * @param cidr ipv4 or ipv6 formatted cidr . Example 198.51.100.14/24 or 2001:db8::/48
 * @param ip ipv4 or ipv6 address Example 198.51.100.14 or 2001:db8::
 *
 */
export function cidrContains(cidr: string, ip: string): boolean {
  const ipnet = new IpNet(cidr);
  return ipnet.contains(ip);
}