Function networkAddress

bgp/bgp.ts:52–73

(ip: string, mask: number)

        (((parts[0] << 24) |
            (parts[1] << 16) |
            (parts[2] << 8) |
            parts[3]) >>> 0);

    const maskNum = mask === 0 ? 0 : ((~0 << (32 - mask)) >>> 0);
    const netNum = ipNum & maskNum;

    const netParts = [
        (netNum >>> 24) & 255,
        (netNum >>> 16) & 255,
        (netNum >>> 8) & 255,
        netNum & 255,
    ];

    return `${netParts.join(".")}/${mask}`;
}

function normalizeIP(input: string): string | null {
    const clean = input.trim();
    if (!clean || clean.includes("/")) return null;
    const m = clean.match(/^(\d{1,3}(?:\.\d{1,3}){3})$/);
    if (!m) return null;
    const ip = m[1];
    if (!isValidIPv4(ip)) return null;
    return ip;
}