Test Data - Credit Card Numbers

American Express
American Express numbers start with 34 or 37 and are 15 digits long

340000000000009
341111111111111
370000000000002
371449635398431
372425119311008
378282246310005
378734493671000

Australian BankCard

5610591081018250

Diners Club Card

30569309025904

38520000023237

Discover Card
Discover Card number start with 6011 or 650 and are 16 digits long

6011000000000004
6011000000000012
6011000990139424
6011111111111117
6011601160116611

JCB Card

3530111333300000

3566002020360505

MasterCard
MasterCard numbers start with 51-55 and are 16 digits long

5105105105105100
5276440065421319
5424000000000015
5431111111111111
5500000000000004
5555555555554444

Visa
Visa numbers start with 4 and are 13 or 16 digits long

4007000000027
4012888818888
4222222222222
4012888888881881
4111111111111111

Also see:

http://www.darkcoding.net/credit-card-numbers/
http://en.wikipedia.org/wiki/Luhn_algorithm
http://en.wikipedia.org/wiki/Credit_card_number