A tax processing number, issued by the IRS, for certain resident and non-resident aliens, their spouses, and dependents; All valid ITINs are a nine-digit number in the same format as the SSN (9XX-8X-X), begins with a “9” and the 4th and 5th digits range from 50 to 65, 70 to 88, 90 to 92, and 94 to 99.