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
2019-09-23 385-343 0–9 XXXall 10 · 3 holders which blocks → EXIANT COMMUNICATIONS LLC 114J SALT LAKE UT
2019-08-12 385-412 0–9 XXXwhole prefix which blocks → ONVOY, LLC - UT 871E PROVO UT
2019-08-06 385-349 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2019-07-16 385-398 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F SPRINGVL UT
2019-07-10 385-334 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AMERCNFORK UT
2019-07-02 385-344 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J SPANIHFORK UT
2019-06-27 385-308 0–9 XXXall 10 · 5 holders which blocks → VOIP INNOVATIONS, LLC 597F MIDVALE UT
2019-06-27 385-432 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 OGDEN UT
2019-06-25 385-326 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
2019-06-18 385-401 0–9 XXXall 10 · 3 holders which blocks → VOIP INNOVATIONS, LLC 597F SALT LAKE UT
2019-06-07 385-338 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - UT 871E LEHI UT
2019-06-07 385-438 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - UT 871E PAYSON UT
2019-06-07 385-442 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - UT 871E CLEARFIELD UT
2019-06-05 385-324 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J BOUNTIFUL UT
2019-06-03 385-314 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 PROVO UT
2019-05-29 385-332 0–9 XXXall 10 · 4 holders which blocks → FIRSTDIGITAL COMMUNICATIONS, LLC 716D KAYSVILLE UT
2019-05-23 385-330 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F PLEASATGRV UT
2019-05-10 385-339 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F AMERCNFORK UT
2019-05-06 385-304 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AMERCNFORK UT
2019-04-15 385-327 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F SPRINGVL UT
2019-04-15 385-328 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AMERCNFORK UT
2019-04-11 385-552 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2019-04-09 385-799 0–9 XXXall 10 · 5 holders which blocks → HD CARRIER LLC 321J SALT LAKE UT
2019-03-22 385-303 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KAYSVILLE UT
2019-03-07 385-296 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J MIDVALE UT
2019-02-28 385-302 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MIDVALE UT
2019-02-25 385-400 0–9 XXXall 10 · 4 holders which blocks → TERRA NOVA TELECOM INC. 145J OGDEN UT
2019-01-31 385-301 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 SALT LAKE UT
2019-01-25 385-387 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AMERCNFORK UT
2019-01-24 385-500 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H SALT LAKE UT
2019-01-24 385-600 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H OGDEN UT
2019-01-11 385-320 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KAYSVILLE UT
2019-01-08 385-294 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
2018-12-31 385-287 0–9 XXXall 10 · 5 holders which blocks → QWEST CORPORATION 9636 LEHI UT
2018-12-17 385-292 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PROVO UT
2018-12-04 385-286 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2018-10-22 385-284 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 MORGAN UT
2018-10-09 385-295 0–9 XXXall 10 · 5 holders which blocks → FIRSTDIGITAL COMMUNICATIONS, LLC 716D SALT LAKE UT
2018-09-26 385-283 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F PROVO UT
2018-09-24 385-276 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F MIDVALE UT
2018-09-24 385-280 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KAYSVILLE UT
2018-09-24 385-281 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MIDVALE UT
2018-09-04 385-420 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2018-08-22 385-479 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2018-06-29 385-273 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F PLEASATGRV UT
2018-06-22 385-270 0–9 XXXall 10 · 4 holders which blocks → ADVANCED TELECOM SOLUTIONS, LLC 181J SALT LAKE UT
2018-06-20 385-501 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F SALT LAKE UT
2018-05-08 385-955 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2018-04-17 385-492 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 OGDEN UT
2018-03-26 385-367 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - UT 871E CLEARFIELD 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.