Did you know that I-94 information has been online since 2013? This means that when you enter the US, you no longer get paper I-94s. Instead, you must obtain your I-94 information at the CBP website.
You will not have I-94 information if you are a US citizen, lawful permanent resident, visa waiver entrant, and certain others.
It is a good idea to go to the Customs and Border Protection website shortly after you arrive to make sure that the I-94 information is correct. Sometimes, CBP makes mistakes in coding the manner of your entry, the date of your entry, or the length of your authorized stay.