Area code 951 – California
951 has served California since 2004, split from 909. 696 of its 786 number blocks are allocated (89%). No carrier dominates: AT&T 23.9%, T-Mobile 17.2%, Verizon 16.2%. 687 FTC complaints named a 951 caller ID in the 33 days to 30 October 2026, putting it 134th of 422 codes with five or more complaints.
- State
- California
- In service since
- 2004
- Time zone
- Pacific
- Shares area with
- No overlay
Who holds 951 number blocks
Share of the 696 assigned NXX blocks (88.5% of the 786 possible), across 36 carriers. This is share of number blocks, not of subscribers.
- AT&T23.9%
- T-Mobile20.7%
- Verizon16.2%
- Frontier9.9%
- Onvoy6.8%
- Lumen6.6%
- Other CLEC / VoIP5.3%
- Bandwidth4.6%
- Charter3.2%
- TPx1.4%
- Peerless0.7%
- Vonage0.3%
- American Messaging0.1%
- Telnyx0.1%
- Dish0.1%
Spam complaints naming 951
FTC Do Not Call complaints where the caller ID was a 951 number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are frequently spoofed, so these are complaints about the code, not calls proven to originate in it.
Rate centers in 951
NANPA allocates number blocks to rate centers and records their names abbreviated to ten characters, so these are NANPA's codes rather than place names – CHAMPAURBN is Champaign-Urbana, NWYRCYZN01 is a New York City zone. We show them unchanged instead of guessing at the full names. Showing the largest 5 of 21.
Timeline
- 2004 951 goes into service, split from or overlaid on 909.
More about 951
Separate pages for the questions that need their own answer: what time it is there, what the complaint data says, who holds the number blocks, and how the code compares with the one it shares its area with.
Frequently asked about 951
What state is area code 951?
California.
Is a call from 951 a scam?
Not by itself. 951 drew 687 FTC complaints in the 33 days to 30 October 2026, 134th of 422 ranked codes – mid-pack or lower. Spam callers spoof caller IDs, so the only useful check is the full number.
Which carrier owns 951 numbers?
AT&T holds the largest share of assigned number blocks at 23.9%. The rest is spread across 3 other carriers. This is share of number blocks, not of subscribers – people keep their numbers when they switch carriers.
Do I need to dial 10 digits in 951?
NANPA records the local dialing plan for 951 as “1+10D”.
Sources and verification
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, retrieved Nov 1, 2026
- FTC – Do Not Call Reported Calls Data, 25 daily files 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
NANPA dialing note for this code: “1+10D”. Reviewed by the data desk. Spotted an error? Request a correction.