Function isValidIPv4

bgp/bgp.ts:43–50

(ip: string)

        return Number.isInteger(n) && n >= 0 && n <= 255;
    });
}

function networkAddress(ip: string, mask: number): string | null {
    if (!isValidIPv4(ip)) return null;

    const parts = ip.split(".").map((p) => Number(p));
    const ipNum =
        (((parts[0] << 24) |
            (parts[1] << 16) |
            (parts[2] << 8) |
            parts[3]) >>> 0);