NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 209
PACIFIC BELL 181
NEW CINGULAR WIRELESS PCS, LLC 128
ONVOY, LLC - CA 76
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 71
T-MOBILE USA, INC. 69
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
2019-02-21 209-319 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E TRACY CA
2018-11-26 209-519 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 LOS BANOS CA
2018-10-22 209-310 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F LODI CA
2018-09-27 209-316 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F PLANADA CA
2018-08-17 209-488 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 MODESTO CA
2018-06-25 209-301 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 MODESTO CA
2018-04-26 209-307 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 STOCKTON CA
2018-03-26 209-695 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PATTERSON CA
2018-03-15 209-458 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7128 MODESTO CA
2018-01-12 209-449 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LIVINGSTON CA
2018-01-08 209-219 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ATWATER CA
2017-11-10 209-897 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 VALLEY SPG CA
2017-08-31 209-290 0–9 XXXall 10 · 6 holders which blocks → VONAGE AMERICA LLC 197D STOCKTON CA
2017-06-15 209-268 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F JACKSON CA
2017-04-14 209-305 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MANTECA CA
2017-03-29 209-672 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MODESTO CA
2017-03-24 209-990 0–9 XXXall 10 · 5 holders which blocks → COMMIO, LLC 939H STOCKTON CA
2017-03-20 209-638 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H TURLOCK CA
2017-02-28 209-299 0–9 XXXwhole prefix which blocks → ONVOY, LLC - CA 649C STOCKTON CA
2017-02-17 209-318 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 OAKDALE CA
2016-12-30 209-459 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 TUOLUMNE CA
2016-12-15 209-308 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H MERCED CA
2016-11-28 209-621 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 HUGHSON CA
2016-11-21 209-905 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 STOCKTON CA
2016-11-04 209-804 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ESCALON CA
2016-09-02 209-641 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 STOCKTON CA
2016-08-31 209-306 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SANANDREAS CA
2016-08-26 209-360 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MODESTO CA
2016-08-15 209-592 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E LOS BANOS CA
2016-07-29 209-279 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 STOCKTON CA
2016-07-19 209-719 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C RIVERBANK CA
2016-06-29 209-707 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MANTECA CA
2016-06-24 209-309 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C GROVELAND CA
2016-06-24 209-314 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C GALT CA
2016-05-24 209-280 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 LODI CA
2016-05-17 209-802 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 NEWMAN CA
2016-05-16 209-237 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7128 TRACY CA
2016-05-16 209-278 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 TRACY CA
2016-04-06 209-702 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MODESTO CA
2016-03-09 209-945 0–9 XXXwhole prefix which blocks → UTILITY TELECOM GROUP, LLC - CA 9262 STOCKTON CA
2015-12-11 209-203 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ATWATER CA
2015-10-13 209-493 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F OAKDALE CA
2015-10-05 209-420 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 STOCKTON CA
2015-09-16 209-287 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MODESTO CA
2015-09-11 209-285 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MERCED CA
2015-09-11 209-561 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 STOCKTON CA
2015-08-03 209-281 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MODESTO CA
2015-07-31 209-635 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ATWATER CA
2015-07-02 209-291 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MERCED CA
2015-06-12 209-637 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TRACY 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.