You can find the default modem password for you model:
| Model | Login | Username | Password |
|---|---|---|---|
| COREBUILDER Rev. 7000/6000/3500/2500 | TELNET | debug | synnet |
| COREBUILDER Rev. 7000/6000/3500/2500 | TELNET | tech | tech |
| HIPERARC Rev. V4.1.X | TELNET | adm | (none) |
| LANPLEX Rev. 2500 | TELNET | debug | synnet |
| LANPLEX Rev. 2500 | TELNET | tech | tech |
| LINKSWITCH Rev. 2000/2700 | TELNET | tech | tech |
| NETBUILDER | SNMP | ANYCOM | |
| NETBUILDER | SNMP | ILMI | |
| NETBUILDER | MULTI | admin | (none) |
| OFFICE CONNECT ISDN ROUTERS Rev. 5X0 | TELNET | n/a | PASSWORD |
| SUPERSTACK II SWITCH Rev. 2200 | TELNET | debug | synnet |
| SUPERSTACK II SWITCH Rev. 2700 | TELNET | tech | tech |
| OFFICECONNECT 812 ADSL | MULTI | adminttd | adminttd |
| WIRELESS AP Rev. ANY | MULTI | admin | comcomcom |
| CELLPLEX Rev. 7000 | TELNET | tech | tech |
| CELLPLEX Rev. 7000 | TELNET | admin | admin |
| HIPERARC Rev. V4.1.X | TELNET | adm | (none) |
| LANPLEX Rev. 2500 | TELNET | tech | (none) |
| CELLPLEX | HTTP | admin | synnet |
| SUPERSTACK II SWITCH Rev. 2700 | TELNET | tech | tech |
| CELLPLEX Rev. 7000 | TELNET | root | (none) |
| HIPERACT Rev. V4.1.X | TELNET | admin | (none) |
| CELLPLEX Rev. 7000 | TELNET | tech | (none) |
| CELLPLEX Rev. 7000 | TELNET | admin | admin |
| SUPERSTACK 3 Rev. 4XXX | MULTI | admin | (none) |
| SUPERSTACK 3 Rev. 4XXX | MULTI | monitor | monitor |
| SUPERSTACK 3 Rev. 4400-49XX | MULTI | manager | manager |
| NETBUILDER | HTTP | Root | (none) |
| 3C16450 | MULTI | admin | (none) |
| 3C16406 | MULTI | admin | (none) |
| OFFICE CONNECT ISDN ROUTERS Rev. 5X0 | TELNET? | n/a | PASSWORD |
| COREBUILDER Rev. 7000/6000/3500/2500 | TELNET | n/a | admin |
| COREBUILDER Rev. 7000/6000/3500/2500 | TELNET | n/a | (none) |
| OFFICECONNECT ADSL WIRELESS 11G FIREWALL ROUTER Rev. 3CRWDR100-72 | HTTP | (none) | admin |
| INTERNET FIREWALL Rev. 3C16770 | HTTP | admin | password |
| SHARK FIN Rev. COMCAST-SUPPLIED | HTTP | User | Password |
| 812 | HTTP | Administrator | admin |
| CELLPLEX Rev. 7000 | TELNET | operator | (none) |
| 3COM SUPERSTACK 3 SWITCH 3300XM | MULTI | security | security |
| SUPERSTACK II Rev. 1100/3300 | CONSOLE | 3comcso | RIP000 |
| NETBUILDER | SNMP | (none) | admin |
| CELLPLEX Rev. 7000 | TELNET | tech | tech |
| SUPER | TELNET | admin | (none) |
| CELLPLEX Rev. 7000 | MULTI | admin | admin |
| CELLPLEX Rev. 7000 | TELNET | root | (none) |
| NETBUILDER | MULTI | admin | (none) |
| CELLPLEX Rev. 7000 | TELNET | operator | (none) |
| OFFICECONNECT 812 ADSL Rev. 01.50-01 | MULTI | admin | (none) |
| CELLPLEX | MULTI | admin | admin |
| HIPERACT Rev. V4.1.X | TELNET | admin | (none) |
| 3C16405 | MULTI | n/a | (none) |
| 3C16405 | CONSOLE | Administrator | (none) |
| SWITCH Rev. 3300XM | MULTI | admin | admin |
| SS III SWITCH Rev. 4XXX (4900 - SURE) | TELNET | recovery | recovery |
| OFFICECONNECT WIRELESS 11G CABLE/DSL GATEWAY | HTTP | (none) | admin |
| 3C16405 | MULTI | admin | (none) |
| OFFICECONNECT 812 ADSL Rev. 01.50-01 | MULTI | admin | (none) |
| CELLPLEX | MULTI | n/a | (none) |
| CELLPLEX | MULTI | admin | admin |
| HIPERACT Rev. V4.1.X | TELNET | admin | (none) |
| 3C16405 | CONSOLE | Administrator | (none) |
| CELLPLEX Rev. 7000 | TELNET | tech | (none) |
| SWITCH Rev. 3300XM | MULTI | admin | admin |
| SS III SWITCH Rev. 4XXX (4900 - SURE) | TELNET | recovery | recovery |
| OFFICECONNECT WIRELESS 11G CABLE/DSL GATEWAY | HTTP | (none) | admin |
| 3CRADSL72 Rev. 1.2 | MULTI | (none) | 1234admin |
| CB9000 / 4007 Rev. 3 | CONSOLE | Type User: FORCE | (none) |
| OFFICECONNECT | MULTI | n/a | (none) |
| SUPERSTACK II NETBUILDER Rev. 11.1 | MULTI | n/a | (none) |
| OFFICECONNECT | MULTI | admin | (none) |
| OFFICE CONNECT Rev. 11G | MULTI | admin | (none) |
3Com Corporation was a digital electronics manufacturer best known for its computer network infrastructure products. The company was co-founded in 1979 by Robert Metcalfe, Howard Charney, Bruce Borden, and Greg Shaw and recruited Bill Krause from Hewlett-Packard to be its president in February 1981 when it raised its first round of venture capital. Metcalfe has explained that he came up with the name 3Com as a contraction of "Computer Communication Compatibility", with its focus on deploying the Ethernet technology that he had co-invented, which enabled the networking of computers.
3Com provided network interface controllers and switches, routers, wireless access points and controllers, IP voice systems, and intrusion prevention systems. The company was based in Santa Clara, Calif., USA. From its 2007 acquisition of 100 percent ownership of H3C Technologies Co., Limited (H3C) —initially a joint venture with China-based Huawei Technologies—3Com achieved a leading market presence in China, and a significant networking market share in Europe, Asia, and the Americas.[citation needed] 3Com products were sold under the brands 3Com, H3C, and TippingPoint.
On April 12, 2010, Hewlett-Packard completed the acquisition of 3Com. Since the acquisition, 3Com has been fully absorbed by Hewlett-Packard and no longer exists as a separate entity.
From Wikipedia