Prefix 408-300 — San Jose:south Da, CA

NANPA CO code assignment, current as of July 28, 2026.

A phone number starting 408-300 was issued in the San Jose:south Da rate center of CA — part of area code 408.

NANPA's central-office code records list COMCAST PHONE OF CALIFORNIA, LLC (OCN 394L) as the code holder, assigned August 11, 2008. Because 408-300 participates in thousands-block pooling, individual 1,000-number blocks may belong to other carriers than the code holder.

A scammer can display 408-300 without ever touching CA. When in doubt, end the call and reach the company or agency through its official website; unwanted robocalls belong in the FTC's fraud report queue.

San Jose:south Da is part of the San Jose-Sunnyvale-Santa Clara, CA Metropolitan Statistical Area. For routing purposes it sits in LATA 722. Numbers here keep Pacific time.

Neighboring prefixes

FAQ

Where is 408-300 located?

The prefix is assigned to the San Jose:south Da rate center in CA, area code 408. It is part of the San Jose-Sunnyvale-Santa Clara, CA Metropolitan Statistical Area.

Which company owns 408-300 numbers?

COMCAST PHONE OF CALIFORNIA, 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 408-300 safe to answer?

The prefix itself says nothing about the caller. Legitimate San Jose:south Da businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.