|Hi, in terms of tracking website visitors, your web hosting provider often has built-in reporting features. |
If the reverse IP lookup method isn't sufficient or accurate enough for your needs, you might try creating a web form to handle the solicitations where you have established required input fields that would help further identify the person (e.g. first name, last name, title, company/organization, phone number, email, and etc.). In this manner, you would have more information in which you can validate the identity prior to responding.