NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

2 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, last 30 days — NPA 925
ONVOY, LLC - CA 2
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2021-01-27 925-599 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H LIVERMORE CA
2020-11-13 925-744 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H WALNUT CRK CA
2020-11-11 925-515 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C CONCORD CA
2020-11-03 925-578 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ECONTRCOST CA
2020-10-15 925-489 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2020-09-17 925-466 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H CONCORD CA
2020-09-17 925-533 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H LIVERMORE CA
2020-07-14 925-410 0–9 XXXwhole prefix which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J PLEASANTON CA
2020-06-26 925-450 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E ECONTRCOST CA
2020-04-21 925-341 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LIVERMORE CA
2019-10-09 925-430 0–9 XXXall 10 · 5 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L WALNUT CRK CA
2019-08-06 925-534 0–9 XXXwhole prefix which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LIVERMORE CA
2019-07-31 925-414 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CONCORD CA
2019-06-24 925-488 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F WALNUT CRK CA
2019-03-20 925-655 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H CONCORD CA
2019-03-20 925-758 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H LIVERMORE CA
2019-03-20 925-799 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H PITTSBURG CA
2019-03-20 925-877 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H ANTIOCH CA
2019-01-18 925-477 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2018-11-19 925-412 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CONCORD CA
2018-11-02 925-440 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WALNUT CRK CA
2018-03-23 925-510 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 CONCORD CA
2017-12-26 925-499 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 CONCORD CA
2017-12-26 925-542 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WALNUT CRK CA
2017-08-18 925-409 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LIVERMORE CA
2017-03-23 925-503 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2017-03-17 925-532 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H WALNUT CRK CA
2017-03-17 925-536 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H CONCORD CA
2017-01-13 925-306 0–9 XXXall 10 · 6 holders which blocks → SONIC TELECOM, LLC - CA 433E ECONTRCOST CA
2016-09-10 925-214 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F WALNUT CRK CA
2016-08-30 925-436 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2016-08-02 925-495 0–9 XXXall 10 · 8 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E LIVERMORE CA
2016-06-29 925-375 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CONCORD CA
2016-05-02 925-266 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WALNUT CRK CA
2016-04-11 925-390 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ECONTRCOST CA
2015-11-02 925-433 0–9 XXXall 10 · 5 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L WALNUT CRK CA
2015-09-22 925-204 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2015-06-16 925-393 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C WALNUT CRK CA
2015-04-23 925-483 0–9 XXXall 10 · 5 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L CONCORD CA
2015-04-16 925-494 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E CONCORD CA
2014-12-11 925-378 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WALNUT CRK CA
2014-12-05 925-384 0–9 XXXall 10 · 4 holders which blocks → AT&T ENTERPRISES, LLC 516C ANTIOCH CA
2014-11-10 925-379 0–9 XXXwhole prefix which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 PLEASANTON CA
2014-09-08 925-329 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ANTIOCH CA
2014-05-23 925-490 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E CONCORD CA
2014-04-28 925-448 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WALNUT CRK CA
2014-03-24 925-481 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ANTIOCH CA
2013-11-25 925-391 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CONCORD CA
2013-10-24 925-278 0–9 XXXall 10 · 7 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L WALNUT CRK CA
2013-04-19 925-428 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.