Prefix 408-329 — Sunnyvale, CA
408-329 identifies a block of numbers in Sunnyvale, CA, within the 408 area code. Every US prefix is tied to exactly one rate center; this one is Sunnyvale.
The rate center lies in the San Jose-Sunnyvale-Santa Clara, CA Metropolitan Statistical Area. The serving LATA is 722. Local time follows the Pacific zone.
Treat the on-screen number as a hint, not evidence — 408-329 can be spoofed like any US prefix. If a call feels off, verify through an official callback number and file a complaint with the FCC or FTC.
NANPA's central-office code records list LEVEL 3 COMMUNICATIONS, LLC - CA (OCN 8826) as the code holder, assigned September 16, 2002. Because 408-329 participates in thousands-block pooling, individual 1,000-number blocks may belong to other carriers than the code holder.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 408-326 | San Jose:west Da | PACIFIC BELL |
| 408-327 | San Jose:west Da | PACIFIC BELL |
| 408-328 | Sunnyvale | PACIFIC BELL |
| 408-330 | San Jose:west Da | PACIFIC BELL |
| 408-331 | Sunnyvale | MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
| 408-332 | San Jose:west Da | NEW CINGULAR WIRELESS PCS, LLC |
FAQ
Where is 408-329 located?
The prefix is assigned to the Sunnyvale rate center in CA, area code 408. It is part of the San Jose-Sunnyvale-Santa Clara, CA Metropolitan Statistical Area.
Which company owns 408-329 numbers?
LEVEL 3 COMMUNICATIONS, LLC - CA holds the code, but the prefix is pooled — individual thousands-blocks can be assigned to other carriers, and numbers may be ported to any provider.
Is a call from 408-329 safe to answer?
The prefix itself says nothing about the caller. Legitimate Sunnyvale businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.