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
Aug 2026
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Oct 2025
| Assigned | NPA-NXX | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|
| 925-553 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DANVILLE | CA | |
| 925-555 | MULTIPLE OCN LISTING | MULT | DIR ASST | CA | |
| 925-556 | PACIFIC BELL | 9740 | DUBLN-SNRM | CA | |
| 925-557 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | DUBLN-SNRM | CA | |
| 925-558 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DUBLN-SNRM | CA | |
| 925-560 | PACIFIC BELL | 9740 | DUBLN-SNRM | CA | |
| 925-566 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | CONCORD | CA | |
| 925-568 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SUNOL | CA | |
| 925-570 | T-MOBILE USA, INC. | 6529 | DUBLN-SNRM | CA | |
| 925-571 | NORTH COUNTY COMMUNICATION CORPORATION - CA | 7894 | BSHP RNCH | CA | |
| 925-572 | NORTH COUNTY COMMUNICATION CORPORATION - CA | 7894 | PLEASANTON | CA | |
| 925-573 | NORTH COUNTY COMMUNICATION CORPORATION - CA | 7894 | PITTSBURG | CA | |
| 925-575 | METROPCS, INC. | 5562 | DANVILLE | CA | |
| 925-580 | T-MOBILE USA, INC. | 6529 | PLEASANTON | CA | |
| 925-583 | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | LIVERMORE | CA | |
| 925-584 | T-MOBILE USA, INC. | 6529 | ANTIOCH | CA | |
| 925-586 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | CONCORD | CA | |
| 925-587 | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | DUBLN-SNRM | CA | |
| 925-588 | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | WALNUT CRK | CA | |
| 925-592 | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | MORAGA | CA | |
| 925-596 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | PLEASANTON | CA | |
| 925-597 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | PITTSBURG | CA | |
| 925-598 | PACIFIC BELL | 9740 | PLEASANTON | CA | |
| 925-600 | PACIFIC BELL | 9740 | PLEASANTON | CA | |
| 925-602 | PACIFIC BELL | 9740 | CONCORD | CA | |
| 925-603 | PACIFIC BELL | 9740 | CONCORD | CA | |
| 925-605 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | LIVERMORE | CA | |
| 925-606 | PACIFIC BELL | 9740 | LIVERMORE | CA | |
| 925-609 | PACIFIC BELL | 9740 | CONCORD | CA | |
| 925-611 | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | CA | |
| 925-623 | T-MOBILE USA, INC. | 6529 | PLEASANTON | CA | |
| 925-625 | PACIFIC BELL | 9740 | ECONTRCOST | CA | |
| 925-626 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ECONTRCOST | CA | |
| 925-628 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | ANTIOCH | CA | |
| 925-631 | PACIFIC BELL | 9740 | MORAGA | CA | |
| 925-634 | PACIFIC BELL | 9740 | ECONTRCOST | CA | |
| 925-635 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | PITTSBURG | CA | |
| 925-640 | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DUBLN-SNRM | CA | |
| 925-642 | NEW CINGULAR WIRELESS PCS, LLC | 6010 | ANTIOCH | CA | |
| 925-646 | PACIFIC BELL | 9740 | CONCORD | CA | |
| 925-648 | PACIFIC BELL | 9740 | DANVILLE | CA | |
| 925-658 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | WALNUT CRK | CA | |
| 925-659 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | BSHP RNCH | CA | |
| 925-660 | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | PLEASANTON | CA | |
| 925-663 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | SUNOL | CA | |
| 925-664 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | PSBG WEST | CA | |
| 925-665 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | PITTSBURG | CA | |
| 925-666 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | ECONTRCOST | CA | |
| 925-671 | PACIFIC BELL | 9740 | CONCORD | CA | |
| 925-672 | PACIFIC BELL | 9740 | CLAYTON | 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.