The US I-94 form is now online and electronic. You can find your number at the following site:
-- I-94 DHS Information
On the above site you can enter your information and print a copy of your electronic I-94 record. For visa petitions,
please attach this printed page (containing your electronic I-94 information) and include it with a copy of your US visa and associated
entry stamp (in your passport).
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NOTE: The above information does not address the specific requirements for any given case and is not a substitute for the advice of an attorney.