The easiest way to find INN of the physical person passport through the official website of the Federal tax service. However, this method will only work if you already got your INN. Go to the resource tab titled "registration of natural persons". Go down and click on "See INN". Personal data it is better to prepare in advance – it will greatly simplify the task.
In the opened window enter the serial number of your passport responsible for issuing institutions, as well as the date when you received the document. In addition, the site may prompt you place, your date of birth and any other relevant information. It is worth considering that the number was individuals not just by passport. Will fit most other documents allowing to certify the identity. Also if you are a citizen of another country, you will be offered the option of a passport.
The next step is to input the security code. If you can't enter it the first time, upgrade protection until then, until you are confident that you will be able to enter the code. Then click on the "Send request" and wait for a while. You will be presented with your individual tax identification number.
To get INN, you can go to the tax office or order it by mail using the website Services.
To know was another individual is possible only with a personal visit to the tax office. Keep in mind that you will have to pay 100 rubles.