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Is there a canonical "test SSN" that is used by convention, so is understood by all who see it that it is not a real SSN?
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Social Security Number All ones (111111111) All threes (333333333) Consecutive digits in numerical order (123456789)
Structure. The Social Security number is a nine-digit number in the format "AAA-GG-SSSS".
The last four digits of the SSN are the serial number. The serial number represents a straight numerical series of numbers from 0001–9999 within each group. Serial number 0000 is not assigned.
The first three (3) digits of a person's social security number are determined by the ZIP Code of the mailing address shown on the application for a social security number. Prior to 1973, social security numbers were assigned by our field offices.
There are multiple number groups and some particular numbers that will never be allocated:
Consider using one of these (the obviously invalid 000-00-0000 would be a good one IMO).
(Answer has been updated to provide source information beyond Wikipedia and remove information that is no longer accurate after the SSA made its randomization change in mid 2011.)
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