NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 210
SOUTHWESTERN BELL 281
NEW CINGULAR WIRELESS PCS, LLC - IL 129
T-MOBILE USA, INC. 94
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 54
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 39
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
2026-07-08 210-755 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2024-10-16 210-578 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SANANTONIO TX
2024-03-01 210-594 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2024-01-25 210-830 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2023-11-06 210-917 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 SANANTONIO TX
2023-10-31 210-726 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SANANTONIO TX
2023-10-31 210-786 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SANANTONIO TX
2023-08-31 210-759 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2023-05-22 210-512 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2023-01-06 210-210 0–9 XXXall 10 · 2 holders which blocks → USFON, INC. - TX 473F SANANTONIO TX
2022-04-28 210-939 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2022-04-14 210-500 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 SANANTONIO TX
2021-03-01 210-964 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2021-03-01 210-985 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2021-02-25 210-956 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 SANANTONIO TX
2021-01-04 210-953 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2020-09-28 210-948 0–9 XXXall 10 · 2 holders which blocks → IP HORIZON LLC 515J SANANTONIO TX
2020-09-24 210-935 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 SANANTONIO TX
2020-09-02 210-934 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2020-08-28 210-895 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 SANANTONIO TX
2020-08-28 210-898 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J SANANTONIO TX
2020-08-14 210-891 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F SANANTONIO TX
2020-08-12 210-873 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 SANANTONIO TX
2020-08-12 210-972 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2020-08-03 210-868 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 SANANTONIO TX
2020-06-04 210-866 0–9 XXXall 10 · 2 holders which blocks → CSC WIRELESS, LLC 425J SANANTONIO TX
2020-04-06 210-851 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 SANANTONIO TX
2020-04-03 210-942 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2020-04-02 210-968 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SANANTONIO TX
2020-04-01 210-864 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F SANANTONIO TX
2020-02-21 210-809 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 SANANTONIO TX
2020-02-20 210-940 0–9 XXXall 10 · 2 holders which blocks → HD CARRIER LLC 321J SANANTONIO TX
2020-01-17 210-796 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2019-11-04 210-794 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF TEXAS, LLC - TX 177F SANANTONIO TX
2019-10-30 210-756 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2019-10-29 210-903 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2019-09-12 210-915 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H SANANTONIO TX
2019-04-26 210-890 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 SANANTONIO TX
2019-01-18 210-783 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 SANANTONIO TX
2018-10-22 210-936 0–9 XXXwhole prefix which blocks → SOUTHWESTERN BELL 9533 SANANTONIO TX
2018-10-19 210-761 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2018-09-14 210-806 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2018-07-24 210-742 0–9 XXXall 10 · 3 holders which blocks → AIRESPRING, INC. 996H SANANTONIO TX
2018-05-09 210-741 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 SANANTONIO TX
2018-05-02 210-729 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F SANANTONIO TX
2018-03-30 210-728 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 SANANTONIO TX
2017-08-18 210-817 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2017-07-06 210-686 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D SANANTONIO TX
2017-05-05 210-640 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 SANANTONIO TX
2017-05-01 210-469 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F SANANTONIO TX

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.