| Series | Vendor |
| 000 | IBM |
| 010 | Compaq |
| 030 | The American College |
| 050 | Novell |
| 070/075 | Microsoft |
| 073/077 | Microsoft sales |
| 076 | Microsoft Certified Trainer |
| 090 | SCO |
| 0B0 | BEA Systems |
| 0C0 | Cisco Cable Testing |
| 0P0 | Pivotal |
| 0V0 | Vignette |
| 110 | APTC Administration Certification |
| 190 | Lotus |
| 1A0 | Baan |
| 1D0 | CIW |
| 1G0 | Silicon Graphics, Inc. |
| 1H0 | HP Star Program |
| 1K0 | picture Tel |
| 1L0 | Intel |
| 1M0 | Lucent |
| 1R0 | Hewlett-Packard Support |
| 1S0 | Xylan Corporation |
| 1T0 | McAFee Associates |
| 1V0 | CPDT |
| 1Y0 | Citrix |
| 1Z0 | Oracle Corporation |
| 220 | CTIAA+ |
| 225 | CDIA |
| 270 | Computer Associates |
| 2B0 | Cabletron |
| 2M0 | Accpac Program |
| 310 | Sun Microsystems Education |
| 330 | Digital SBG |
| 350 | Cisco Internet work Experts |
| 3H0 | HP Certified Program |
| 310 | ACI Financial Markets Associates |
| 3X0 | LINUX (Sair, Linux & Gnu) |
| 400 | CNX |
| 480 | Great plains Software |
| 490 | Hewlett Packard WCSO |
| 4A0 | Alcatel |
| 4H0 | Hyperion |
| 630 | NAPM |
| 640 | Cisco Training Partner |
| 780 | Centura |
| 880 | 3Com |
| 920 | Nortel Networks |
| 980 | Network Professional Association |
| 9A0 | Adobe |
| 9E0 | Cisco Channel Certification |
| 9K0 | Newbridge Networks |
| 9S0 | CTT |
| 9U0 | Hummingbird Communications |
| 9V0 | Navision Software |
| 9W0 | British Telecom Europe |
| A00 | SAS Institute |
| DD0 | Damgaord |
| DX0 | Nortel Networks |
| HD0 | Help Desk Institute |
| 1K0 | CT1Ai - Net+ |
| LB0 | Lucent |
| LP0 | Lucent |
| N10 | CTIA Network + |
| NR0 | NCR |
| PR0 | PMI |
| RN0 | BMC |
| SK0 | CompTiA Server + |
| TB0 | Tibco |