The much anticipated electronic I-94 form goes into effect April 30th, 2013. From that point forward, those seeking an admission number will need to complete that process via the internet. The site for accessing this electronic process is www.CBP.gov/I94.
Once travelers reach the site, there is some basic personal information to supply–family name, given name and birth date, in addition to information located on the traveler’s passport. That passport information includes the passport number, the country of issuance, the date of entry, and the class of admission. The class of admission could cause some confusion, but it can be easily ascertained by checking the passport stamp associated with the visit.
The site itself is very basic, but it does include a Frequently Asked Questions section that should help guide the traveler through this seemingly uncomplicated process. Customs and Border Protection has provided a demo and slide deck for those with further questions.