NumberResearchRecent prefix assignments
371 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
Which carriers received which NPA-NXX prefixes, and where. Assignments are initial assignments from NANPA records — because of number portability, the current serving carrier of individual numbers may differ. For finer-grained activity, see the thousands-block view above.
Most active assignees, last 30 days
New assignments by month
Sep 2026
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Oct 2025
| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 925-388 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | MORAGA | CA | |
| 925-392 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | ECONTRCOST | CA | |
| 925-394 | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | BSHP RNCH | CA | |
| 925-395 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | WALNUT CRK | CA | |
| 925-396 | ONVOY, LLC - CA | 649C | PLEASANTON | CA | |
| 925-397 | ONVOY, LLC - CA | 649C | PLEASANTON | CA | |
| 925-398 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | PLEASANTON | CA | |
| 925-399 | COMCAST PHONE OF CALIFORNIA, LLC | 394L | PLEASANTON | CA | |
| 925-400 | BANDWIDTH.COM CLEC, LLC - CA | 981E | PLEASANTON | CA | |
| 925-401 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PLEASANTON | CA | |
| 925-402 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ORINDA | CA | |
| 925-403 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LAFAYETTE | CA | |
| 925-404 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DUBLN-SNRM | CA | |
| 925-405 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CONCORD | CA | |
| 925-406 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DANVILLE | CA | |
| 925-407 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WALNUT CRK | CA | |
| 925-408 | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CONCORD | CA | |
| 925-411 | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | CA | |
| 925-413 | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DUBLN-SNRM | CA | |
| 925-415 | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | BSHP RNCH | CA | |
| 925-416 | PACIFIC BELL | 9740 | PLEASANTON | CA | |
| 925-417 | PACIFIC BELL | 9740 | PLEASANTON | CA | |
| 925-418 | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | ECONTRCOST | CA | |
| 925-420 | ONVOY, LLC - CA | 649C | ECONTRCOST | CA | |
| 925-422 | PACIFIC BELL | 9740 | LIVERMORE | CA | |
| 925-423 | PACIFIC BELL | 9740 | LIVERMORE | CA | |
| 925-424 | PACIFIC BELL | 9740 | LIVERMORE | CA | |
| 925-425 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | PLEASANTON | CA | |
| 925-426 | PACIFIC BELL | 9740 | PLEASANTON | CA | |
| 925-427 | PACIFIC BELL | 9740 | PITTSBURG | CA | |
| 925-429 | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CONCORD | CA | |
| 925-431 | PACIFIC BELL | 9740 | PITTSBURG | CA | |
| 925-432 | PACIFIC BELL | 9740 | PITTSBURG | CA | |
| 925-434 | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | ANTIOCH | CA | |
| 925-435 | T-MOBILE USA, INC. | 6529 | CONCORD | CA | |
| 925-437 | NEW CINGULAR WIRELESS PCS, LLC | 6010 | ANTIOCH | CA | |
| 925-438 | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | ORINDA | CA | |
| 925-439 | PACIFIC BELL | 9740 | PITTSBURG | CA | |
| 925-443 | PACIFIC BELL | 9740 | LIVERMORE | CA | |
| 925-444 | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | LAFAYETTE | CA | |
| 925-447 | PACIFIC BELL | 9740 | LIVERMORE | CA | |
| 925-449 | PACIFIC BELL | 9740 | LIVERMORE | CA | |
| 925-451 | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WALNUT CRK | CA | |
| 925-452 | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | DUBLN-SNRM | CA | |
| 925-453 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | LIVERMORE | CA | |
| 925-454 | PACIFIC BELL | 9740 | LIVERMORE | CA | |
| 925-455 | PACIFIC BELL | 9740 | LIVERMORE | CA | |
| 925-456 | PACIFIC BELL | 9740 | LIVERMORE | CA | |
| 925-457 | T-MOBILE USA, INC. | 6529 | WALNUT CRK | CA | |
| 925-458 | PACIFIC BELL | 9740 | PSBG WEST | CA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.