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
2021-02-04 385-371 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 478J SALT LAKE UT
2021-01-13 385-395 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2021-01-12 385-364 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - UT 871E OGDEN UT
2021-01-12 385-379 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - UT 871E SALT LAKE UT
2021-01-12 385-402 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - UT 871E BOUNTIFUL UT
2021-01-12 385-483 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - UT 871E PROVO UT
2021-01-08 385-427 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2020-12-23 385-378 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MURRAY UT
2020-12-17 385-372 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KAYSVILLE UT
2020-12-17 385-397 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KAYSVILLE UT
2020-11-24 385-373 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KAYSVILLE UT
2020-11-04 385-595 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - UT 871E SPRINGVL UT
2020-10-15 385-360 0–9 XXXall 10 · 2 holders which blocks → TWILIO INTERNATIONAL, INC. 506J SALT LAKE UT
2020-10-13 385-382 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F KAYSVILLE UT
2020-10-12 385-363 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2020-10-08 385-380 0–9 XXXall 10 · 5 holders which blocks → ALL WEST/UTAH, INC. 3881 OGDEN UT
2020-10-05 385-361 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J MIDVALE UT
2020-10-05 385-993 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J LEHI UT
2020-09-15 385-977 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2020-09-08 385-362 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KAYSVILLE UT
2020-09-08 385-369 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KAYSVILLE UT
2020-09-04 385-365 0–9 XXXwhole prefix which blocks → ONVOY, LLC - UT 871E AMERCNFORK UT
2020-09-04 385-853 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - UT 871E PLEASATGRV UT
2020-09-02 385-359 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AMERCNFORK UT
2020-09-02 385-376 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PLEASATGRV UT
2020-09-01 385-358 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2020-08-06 385-357 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AMERCNFORK UT
2020-07-28 385-307 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2020-07-28 385-356 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H AMERCNFORK UT
2020-07-28 385-688 0XXX6XXX8XXX · 3 holders which blocks → FRACTEL, LLC 965H GOSHEN UT
2020-07-28 385-758 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H CLEARFIELD UT
2020-07-28 385-842 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H KAYSVILLE UT
2020-07-28 385-855 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H MIDVALE UT
2020-07-28 385-946 0XXX3XXX · 2 holders which blocks → FRACTEL, LLC 965H EAGLE MTN UT
2020-07-06 385-354 0–9 XXXall 10 · 3 holders which blocks → CSC WIRELESS, LLC 425J SALT LAKE UT
2020-06-12 385-353 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AMERCNFORK UT
2020-05-13 385-340 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J BOUNTIFUL UT
2020-05-12 385-346 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MIDVALE UT
2020-03-24 385-341 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2020-03-20 385-366 0–9 XXXwhole prefix which blocks → FIRSTDIGITAL COMMUNICATIONS, LLC 716D MIDVALE UT
2020-01-15 385-386 0–9 XXXall 10 · 5 holders which blocks → HD CARRIER LLC 321J SALT LAKE UT
2020-01-09 385-318 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MURRAY UT
2019-12-23 385-317 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MORGAN UT
2019-12-19 385-310 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2019-12-02 385-316 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FARMINGTON UT
2019-10-21 385-342 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - UT 871E MIDVALE UT
2019-10-21 385-348 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - UT 871E KAYSVILLE UT
2019-10-16 385-306 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2019-09-23 385-291 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KAYSVILLE UT
2019-09-23 385-305 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KAYSVILLE 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.