The basics
What is the I-94 (and how to get yours)
The I-94 is the electronic "Arrival/Departure Record" that U.S. Customs and Border Protection (CBP) creates each time you enter the country. It is what proves you are here legally and tells you two key things: your class of admission (for example, B-2 visitor) and your "Admit Until" date — the last day you are allowed to stay. For an extension, USCIS uses that date to decide if you filed on time, so it is the single most important number in your case.
Step by step
1
Open the official CBP I-94 website
Go to i94.cbp.dhs.gov — the only official, free source. Click "Get Most Recent I-94". Never pay a third-party site for this.
2
Enter your details exactly as in your passport
Type your name, birth date, passport number and country exactly as printed in the passport you used to enter. A single typo is the most common reason the record is "not found".
3
Read the two numbers that matter
On the result, find "Admission (I-94) Record Number" and "Admit Until Date". The Admit Until date is your deadline. Save or print the page as a PDF — you will upload it to your case.
What if…
What if my I-94 is "not found"?
Almost always a data mismatch. Try: (1) name spelling exactly as the passport machine-readable zone; (2) swap first/last name order; (3) use the passport you actually entered with (not a renewed one); (4) check the birth date format. If it still fails, CBP has a Deferred Inspection / help line and you can contact the nearest CBP Deferred Inspection Site (see cbp.gov). You can also tell the assistant — it will help you figure out the next step.
My Admit Until says "D/S" — what does that mean?
"D/S" means "Duration of Status" — common for F-1 students and some other categories. It means there is no fixed end date; you stay valid as long as you keep the conditions of your status. B-2 visitors normally get a real date, not D/S.
Official sources
This is general information, not legal advice.