O1 Communications
2002-09-16
2018-03-28
About O1 Communications
O1 Communications is a California-based competitive local exchange carrier (CLEC) founded in 1998, initially focused on providing data telecommunications services to ISPs and later expanding to retail and wholesale business customers. It primarily serves enterprise businesses with voice and data services and wholesale carriers with VoIP peering, call origination, and termination in California and the US. In 2010, it sold its small and medium business customer base to TelePacific Communications; its legacy documents now appear under TPx Communications.
- Parent: TPx Communications
- Founded: 1998
- Headquarters: Sacramento, CA
- Services: wholesale VoIP peering, PSTN trunking, SIP trunking, MPLS, T1 voice/data
Sources: O1 Communications Information - RocketReach · O1 Communications Signs Definitive Agreement to Sell Small and Medium Business Customer Base to TelePacific Communications · Welcome to O1 Communications - TPx [PDF]
Toll-free side: Related toll-free RespOrg: Mpower Communications (code MPC01). View on resporgs.com →
Headquarters: Sacramento, CA
From O1 Communications Inc - CA (OCN 4129), the largest member of the O1 Communications group.


Carrier website
tpx.com: opens in a new tab
Block portfolio at a glance
By age
- Recent (0). Last 18 mo
- Medium (0)
- Old (420)
- Undated (850)
Footprint by state
Stronger blue = more blocks issued in that state. ● marks states with activity in the last 18 months.
- California CA · 1,269
- Georgia GA · 1
Top area codes
Bars show total blocks; red overlay is recent.
Block assignments by year
Member OCNs
2 OCNs roll up under O1 Communications.
| OCN | Company name on file | HQ | Type | Total | Recent |
|---|---|---|---|---|---|
| 4129 | O1 Communications Inc - CA | Sacramento, CA | Competitive Local Exchange Carrier | 1,269 | · |
| 844G | O1 Communications East LLC - GA | El Dorado Hills, CA | Competitive Local Exchange Carrier | 1 | · |
