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 |
|---|---|---|---|---|---|
| 925-314 | PACIFIC BELL | 9740 | DANVILLE | CA | |
| 925-315 | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LIVERMORE | CA | |
| 925-316 | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | MARTINEZ | CA | |
| 925-317 | BANDWIDTH.COM CLEC, LLC - CA | 981E | ORINDA | CA | |
| 925-318 | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | PITTSBURG | CA | |
| 925-319 | T-MOBILE USA, INC. | 6529 | SUNOL | CA | |
| 925-323 | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WALNUT CRK | CA | |
| 925-326 | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CONCORD | CA | |
| 925-327 | PACIFIC BELL | 9740 | BSHP RNCH | CA | |
| 925-328 | PACIFIC BELL | 9740 | BSHP RNCH | CA | |
| 925-333 | AMERICAN MESSAGING SERVICES, LLC | 9748 | WALNUT CRK | CA | |
| 925-335 | PACIFIC BELL | 9740 | MARTINEZ | CA | |
| 925-340 | SPOK, INC. | 6630 | WALNUT CRK | CA | |
| 925-342 | COMMIO, LLC | 939H | WALNUT CRK | CA | |
| 925-343 | AMERICAN MESSAGING SERVICES, LLC | 6906 | PLEASANTON | CA | |
| 925-344 | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | LIVERMORE | CA | |
| 925-345 | AMERICAN MESSAGING SERVICES, LLC | 9748 | DANVILLE | CA | |
| 925-346 | AMERICAN MESSAGING SERVICES, LLC | 9748 | CONCORD | CA | |
| 925-347 | AMERICAN MESSAGING SERVICES, LLC | 9748 | LIVERMORE | CA | |
| 925-349 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | CONCORD | CA | |
| 925-351 | T-MOBILE USA, INC. | 6529 | PLEASANTON | CA | |
| 925-352 | T-MOBILE USA, INC. | 6529 | PLEASANTON | CA | |
| 925-355 | PACIFIC BELL | 9740 | BSHP RNCH | CA | |
| 925-356 | PACIFIC BELL | 9740 | CONCORD | CA | |
| 925-358 | PACIFIC BELL | 9740 | BSHP RNCH | CA | |
| 925-359 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BSHP RNCH | CA | |
| 925-360 | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WALNUT CRK | CA | |
| 925-361 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | DUBLN-SNRM | CA | |
| 925-362 | PACIFIC BELL | 9740 | DANVILLE | CA | |
| 925-363 | PACIFIC BELL | 9740 | CONCORD | CA | |
| 925-364 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | DUBLN-SNRM | CA | |
| 925-365 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | BSHP RNCH | CA | |
| 925-366 | T-MOBILE USA, INC. | 6529 | PLEASANTON | CA | |
| 925-367 | T-MOBILE USA, INC. | 6529 | PLEASANTON | CA | |
| 925-368 | T-MOBILE USA, INC. | 6529 | PLEASANTON | CA | |
| 925-369 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | MARTINEZ | CA | |
| 925-370 | PACIFIC BELL | 9740 | MARTINEZ | CA | |
| 925-371 | PACIFIC BELL | 9740 | LIVERMORE | CA | |
| 925-372 | PACIFIC BELL | 9740 | MARTINEZ | CA | |
| 925-373 | PACIFIC BELL | 9740 | LIVERMORE | CA | |
| 925-374 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MARTINEZ | CA | |
| 925-376 | PACIFIC BELL | 9740 | MORAGA | CA | |
| 925-377 | PACIFIC BELL | 9740 | MORAGA | CA | |
| 925-380 | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | BSHP RNCH | CA | |
| 925-381 | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CONCORD | CA | |
| 925-382 | T-MOBILE USA, INC. | 6529 | ANTIOCH | CA | |
| 925-383 | METROPCS, INC. | 5562 | CONCORD | CA | |
| 925-385 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | LAFAYETTE | CA | |
| 925-386 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | ORINDA | CA | |
| 925-387 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | MARTINEZ | 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.