NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 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, 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
2023-04-11 385-527 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - UT 871E PAYSON UT
2023-04-10 385-523 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AMERCNFORK UT
2023-04-03 385-521 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPANIHFORK UT
2023-03-10 385-520 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J SALT LAKE UT
2023-03-09 385-517 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KAYSVILLE UT
2023-03-09 385-518 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
2023-02-28 385-785 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - UT 871E CLEARFIELD UT
2023-02-22 385-525 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - UT 871E SALT LAKE UT
2023-02-03 385-516 1XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 ALTA UT
2023-01-26 385-514 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
2023-01-20 385-538 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - UT 871E AMERCNFORK UT
2023-01-07 385-513 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MURRAY UT
2023-01-05 385-512 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2022-12-23 385-510 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LEHI UT
2022-12-09 385-509 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F SALT LAKE UT
2022-12-07 385-508 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2022-12-06 385-496 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AMERCNFORK UT
2022-12-06 385-504 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KAYSVILLE UT
2022-12-06 385-506 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MIDVALE UT
2022-12-06 385-507 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
2022-11-15 385-480 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PROVO UT
2022-11-15 385-494 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KAYSVILLE UT
2022-11-08 385-583 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - UT 871E MIDVALE UT
2022-11-08 385-835 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - UT 871E OGDEN UT
2022-10-25 385-491 0–9 XXXall 10 · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7176 SALT LAKE UT
2022-10-24 385-493 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F KAYSVILLE UT
2022-10-21 385-478 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2022-10-10 385-585 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - UT 871E PROVO UT
2022-09-23 385-533 0–9 XXXall 10 · 5 holders which blocks → COMMIO, LLC 939H CLEARFIELD UT
2022-09-20 385-490 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2022-09-15 385-486 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 732J BOUNTIFUL UT
2022-08-23 385-476 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PROVO UT
2022-07-28 385-471 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2022-07-28 385-475 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - UT 871E KAYSVILLE UT
2022-07-22 385-467 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 OGDEN UT
2022-07-22 385-470 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F OGDEN UT
2022-07-21 385-469 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - UT 871E OGDEN UT
2022-07-20 385-463 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MIDVALE UT
2022-04-04 385-462 0–9 XXXall 10 · 2 holders which blocks → AT&T - LOCAL 7421 FARMINGTON UT
2022-03-08 385-464 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MIDVALE UT
2022-02-24 385-526 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CLEARFIELD UT
2022-02-24 385-644 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BOUNTIFUL UT
2022-02-24 385-746 0–9 XXXall 10 · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J LEHI UT
2022-02-24 385-832 0–9 XXXall 10 · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J AMERCNFORK UT
2022-02-18 385-461 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J SALT LAKE UT
2022-02-01 385-874 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J FARMINGTON UT
2022-01-28 385-460 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 OGDEN UT
2022-01-27 385-456 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2022-01-27 385-457 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2022-01-27 385-472 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J PROVO UT

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.