NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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 385
LEVEL 3 COMMUNICATIONS, LLC - UT 1
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
2022-01-27 385-563 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J SALT LAKE UT
2022-01-27 385-566 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J KAYSVILLE UT
2022-01-27 385-865 0–9 XXXall 10 · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J OGDEN UT
2022-01-25 385-454 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2022-01-25 385-459 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KAYSVILLE UT
2022-01-13 385-481 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 ALTA UT
2021-12-17 385-452 0–9 XXXall 10 · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J PROVO UT
2021-12-17 385-453 0–9 XXXall 10 · 6 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J OGDEN UT
2021-12-10 385-622 0–9 XXXall 10 · 7 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SALT LAKE UT
2021-11-10 385-503 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - UT 871E BOUNTIFUL UT
2021-11-03 385-446 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F ALTA UT
2021-10-26 385-426 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F CLEARFIELD UT
2021-10-26 385-443 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2021-10-26 385-451 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2021-10-14 385-502 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KAYSVILLE UT
2021-10-13 385-436 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 SALT LAKE UT
2021-09-28 385-430 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F CLEARFIELD UT
2021-09-01 385-417 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AMERCNFORK UT
2021-09-01 385-431 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AMERCNFORK UT
2021-08-25 385-567 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H PROVO UT
2021-08-25 385-789 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H LEHI UT
2021-07-29 385-409 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KAYSVILLE UT
2021-07-29 385-410 0–9 XXXall 10 · 6 holders which blocks → TELNYX LLC 073H MORGAN UT
2021-07-29 385-413 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KAYSVILLE UT
2021-07-21 385-458 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 MORGAN UT
2021-07-01 385-407 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AMERCNFORK UT
2021-07-01 385-488 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H MIDVALE UT
2021-07-01 385-667 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H AMERCNFORK UT
2021-07-01 385-699 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H SALT LAKE UT
2021-07-01 385-732 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H OGDEN UT
2021-07-01 385-786 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H KAYSVILLE UT
2021-07-01 385-899 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H PAYSON UT
2021-06-04 385-433 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - UT 871E SALT LAKE UT
2021-05-24 385-408 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KAYSVILLE UT
2021-05-19 385-396 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D MURRAY UT
2021-05-19 385-416 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2021-04-30 385-392 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J PROVO UT
2021-04-18 385-837 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J OGDEN UT
2021-04-18 385-910 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - UT 871E SALT LAKE UT
2021-04-13 385-370 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
2021-04-13 385-384 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2021-04-08 385-866 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J PROVO UT
2021-03-19 385-418 0–9 XXXall 10 · 3 holders which blocks → STRATUS NETWORKS 495J SALT LAKE UT
2021-03-15 385-524 0–9 XXXall 10 · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J KAYSVILLE UT
2021-02-24 385-390 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F CLEARFIELD UT
2021-02-16 385-766 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H ALTA UT
2021-02-11 385-487 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J SALT LAKE UT
2021-02-10 385-391 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KAYSVILLE UT
2021-02-05 385-403 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - UT 871E FARMINGTON UT
2021-02-05 385-406 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - UT 871E SPANIHFORK UT

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.