The following is a list of Vendors and Licensees that have been certified through CASS™ and MASS™ address matching software. For some of the products listed there are 2 files; a formatted file for viewing and a text file for optional downloading.

Current Certification Cycle
All certified Products (txt)[1]
DPV® Licensees (txt)[2], (formated-txt)[3]
DSF2™ Licensees (txt)[4], (formated-txt)[5]
eLOT® Vendors (txt)[6], (formatted-txt)[7]
FASTforward® MLOCR Certified Interface Developers (txt)[8]
FASTforward® MLOCR Licensed Service Providers (txt)[9]
LACSLink® Vendors (txt)[10], (formatted-txt)[11]
MLOCR Hardware Manufacturers (txt)[12], (formatted-txt)[13]
MLOCR Mailers/Users (txt)[14], (formatted-txt)[15]
MLOCR Service Bureaus (txt)[16], (formatted-txt)[17]
NCOALink® Full Service Provider Licensees (pdf)[18]
NCOALink® Limited Service Provider Licensees (pdf)[19]
RDI™ Licensees (txt)[20], (formatted-txt)[21]
Software Mailers/Users (txt)[22], (formatted-txt)[23]
Software Manufacturers (txt)[24], (formatted-txt)[25]
Vendor/Service Bureaus (txt)[26], (formatted-txt)[27]
Z4CHANGE (txt)[28], (formatted-txt)[29]

Previous Certification Cycle
All certified Products txt[30]
Carrier Route Utility (txt)[31], (formatted-txt)[32]
DPV® Licensees (txt)[33], (formatted-txt)[34]
DSF2™ Licensees (txt)[35], (formatted-txt)[36]
eLOT® Vendors (txt)[37], (formatted-txt)[38]
MLOCR Hardware Manufacturers (txt)[39], (formatted-txt)[40]
MLOCR Mailers/Users (txt)[41], (formatted-txt)[42]
MLOCR Service Bureaus (txt)[43], (formatted-txt)[44]
Software Mailers/Users (txt)[45], (formatted-txt)[46]
Software Manufacturers (txt)[47], (formatted-txt)[48]
Vendor/Service Bureaus (txt)[49], (formatted-txt)[50]
Z4CHANGE (txt)[51], (formatted-txt)[52]

1. http://ribbs.usps.gov/files/vendors/cassalln.TXT
2. http://ribbs.usps.gov/files/vendors/cassn02d.txt
3. http://ribbs.usps.gov/files/vendors/cassn02.txt
4. http://ribbs.usps.gov/files/vendors/cassn03d.txt
5. http://ribbs.usps.gov/files/vendors/cassn03.txt
6. http://ribbs.usps.gov/files/vendors/cassn10d.TXT
7. http://ribbs.usps.gov/files/vendors/cassn10.TXT
8. http://ribbs.usps.gov/files/vendors/ffdevmlo.txt
9. http://ribbs.usps.gov/files/vendors/fflicmlo.txt
10. http://ribbs.usps.gov/files/vendors/cassn12d.txt
11. http://ribbs.usps.gov/files/vendors/cassn12.txt
12. http://ribbs.usps.gov/files/vendors/cassn06d.TXT
13. http://ribbs.usps.gov/files/vendors/cassn06.TXT
14. http://ribbs.usps.gov/files/vendors/cassn08d.TXT
15. http://ribbs.usps.gov/files/vendors/cassn08.TXT
16. http://ribbs.usps.gov/files/vendors/cassn07d.TXT
17. http://ribbs.usps.gov/files/vendors/cassn07.TXT
18. http://ribbs.usps.gov/files/ncoalink/CERTIFIED_LICENSEES/FULL.PDF
19. http://ribbs.usps.gov/files/ncoalink/CERTIFIED_LICENSEES/LIMITED.PDF
20. http://ribbs.usps.gov/files/vendors/cassn11d.txt
21. http://ribbs.usps.gov/files/vendors/cassn11.txt
22. http://ribbs.usps.gov/files/vendors/cassn05d.TXT
23. http://ribbs.usps.gov/files/vendors/cassn05.TXT
24. http://ribbs.usps.gov/files/vendors/cassn01d.TXT
25. http://ribbs.usps.gov/files/vendors/cassn01.TXT
26. http://ribbs.usps.gov/files/vendors/cassn04d.txt
27. http://ribbs.usps.gov/files/vendors/cassn04.TXT
28. http://ribbs.usps.gov/files/vendors/cassn09d.TXT
29. http://ribbs.usps.gov/files/vendors/cassn09.TXT
30. http://ribbs.usps.gov/files/vendors/cassallO.TXT
31. http://ribbs.usps.gov/files/vendors/cassO11d.TXT
32. http://ribbs.usps.gov/files/vendors/cassO11.TXT
33. http://ribbs.usps.gov/files/vendors/cassO02d.txt
34. http://ribbs.usps.gov/files/vendors/cassO02.txt
35. http://ribbs.usps.gov/files/vendors/cassO03d.txt
36. http://ribbs.usps.gov/files/vendors/cassO03.txt
37. http://ribbs.usps.gov/files/vendors/cassO10d.TXT
38. http://ribbs.usps.gov/files/vendors/cassO10.TXT
39. http://ribbs.usps.gov/files/vendors/cassO06d.TXT
40. http://ribbs.usps.gov/files/vendors/cassO06.TXT
41. http://ribbs.usps.gov/files/vendors/cassO08d.TXT
42. http://ribbs.usps.gov/files/vendors/cassO08.TXT
43. http://ribbs.usps.gov/files/vendors/cassO07d.TXT
44. http://ribbs.usps.gov/files/vendors/cassO07.TXT
45. http://ribbs.usps.gov/files/vendors/cassO05d.TXT
46. http://ribbs.usps.gov/files/vendors/cassO05.TXT
47. http://ribbs.usps.gov/files/vendors/cassO01d.TXT
48. http://ribbs.usps.gov/files/vendors/cassO01.TXT
49. http://ribbs.usps.gov/files/vendors/cassO04d.TXT
50. http://ribbs.usps.gov/files/vendors/cassO04.TXT
51. http://ribbs.usps.gov/files/vendors/cassO09d.TXT
52. http://ribbs.usps.gov/files/vendors/cassO09.TXT
53. http://www.usps.com/common/transparent_exit_page.htm?url=http://www.ribbs.usps.gov/files/vendors/dcvend1.pdf&title=Confirmation Services Certified Vendors List (pdf)
54. http://www.usps.com/common/transparent_exit_page.htm?url=http://www.ribbs.usps.gov/files/vendors/dcvend1.rtf&title=Confirmation Services Certified Vendors List (rtf)
55. http://ribbs.usps.gov/mac.htm
56. http://ribbs.usps.gov/pave.html
57. http://www.usps.com/common/transparent_exit_page.htm?url=http://www.adobe.com/products/acrobat/readstep.html&title=Adobe Acrobat Reader Info/Tips/Download