isIpv4Address.cs

bool isIPv4Address(string inputString) {
    var split = inputString.Split('.');
    if (split.Length != 4) return false;
    
    for (int i = 0; i < 4; i++) {
        var str = split[i];
        int intVal;
        if (!int.TryParse(str, out intVal)) return false;
        if (intVal < 0 || intVal > 255) return false;
    }
    
    return true;
}