Prefix 408-604 — Sunnyvale, CA
Numbers in the 408-604 prefix are registered to the Sunnyvale rate center in CA, inside area code 408. The prefix is the second block of a ten-digit US number (408-604-XXXX) and pins the number to a billing locality.
The assigned code holder is MCIMETRO ACCESS TRANSMISSION SERVICES LLC, operating company number 7229, assigned January 18, 2012. This is a pooled prefix — expect numbers within it to be split across more than one carrier in 1,000-number blocks.
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.
Spoofing means this prefix on your screen doesn't guarantee a Sunnyvale caller. Verify independently before trusting a request for money or data.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 408-601 | San Jose:north Da | BANDWIDTH.COM CLEC, LLC - CA |
| 408-602 | Salinas | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA |
| 408-603 | Campbell | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA |
| 408-605 | San Jose:west Da | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA |
| 408-606 | San Jose:west Da | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA |
| 408-607 | Morgan Hill | NEW CINGULAR WIRELESS PCS, LLC |
FAQ
Where is 408-604 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 408-604 numbers?
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 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 408-604 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.