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

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks taken (last-4 opening)	Code holder	OCN	Rate center	State
2024-07-19	385-586	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	MIDVALE	UT
2024-06-27	385-584	0–9 XXXall 10 · 4 holders which blocks →	BOOST SUBSCRIBERCO L.L.C.	490J	SALT LAKE	UT
2024-06-17	385-582	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - UT	871E	PROVO	UT
2024-06-12	385-581	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	SALT LAKE	UT
2024-05-01	385-580	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	MURRAY	UT
2024-04-23	385-579	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	AMERCNFORK	UT
2024-04-11	385-576	0–9 XXXall 10 · 2 holders which blocks →	ONVOY SPECTRUM, LLC	624H	MURRAY	UT
2024-04-10	385-578	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - UT	871E	SALT LAKE	UT
2024-03-29	385-577	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - UT	871E	KAYSVILLE	UT
2024-03-22	385-575	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT	6571	PROVO	UT
2024-03-18	385-574	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	LEHI	UT
2024-03-13	385-573	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - UT	871E	SALT LAKE	UT
2024-02-21	385-571	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	KAYSVILLE	UT
2024-02-21	385-572	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	KAYSVILLE	UT
2024-02-13	385-568	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - UT	871E	KAYSVILLE	UT
2024-02-13	385-570	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - UT	871E	MIDVALE	UT
2024-02-12	385-569	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	AMERCNFORK	UT
2024-01-30	385-565	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	AMERCNFORK	UT
2023-12-27	385-564	0–9 XXXall 10 · 4 holders which blocks →	FIVE9, INC.	598J	SALT LAKE	UT
2023-12-21	385-562	0–9 XXXall 10 · 7 holders which blocks →	AT&T - LOCAL	7421	BOUNTIFUL	UT
2023-12-01	385-561	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	FIVE9, INC.	598J	OGDEN	UT
2023-11-30	385-560	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	MURRAY	UT
2023-11-27	385-473	0–9 XXXall 10 · 3 holders which blocks →	COMMIO, LLC	939H	PROVO	UT
2023-11-27	385-558	0–9 XXXall 10 · 3 holders which blocks →	COMMIO, LLC	939H	CLEARFIELD	UT
2023-11-27	385-559	0–9 XXXall 10 · 2 holders which blocks →	COMMIO, LLC	939H	KAYSVILLE	UT
2023-10-05	385-556	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	MIDVALE	UT
2023-09-14	385-553	0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	ONVOY, LLC - UT	871E	MORGAN	UT
2023-09-14	385-554	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - UT	871E	MIDVALE	UT
2023-09-06	385-551	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	MURRAY	UT
2023-08-09	385-550	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - UT	871E	BOUNTIFUL	UT
2023-08-01	385-547	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SALT LAKE	UT
2023-08-01	385-548	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SALT LAKE	UT
2023-06-26	385-545	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - UT	871E	OGDEN	UT
2023-06-26	385-546	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - UT	871E	PLEASATGRV	UT
2023-06-22	385-541	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - UT	871E	SALT LAKE	UT
2023-06-22	385-542	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - UT	871E	MURRAY	UT
2023-06-22	385-543	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - UT	871E	SPRINGVL	UT
2023-06-22	385-544	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - UT	871E	KAYSVILLE	UT
2023-06-15	385-678	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - UT	7530	CLEARFIELD	UT
2023-06-15	385-679	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - UT	7530	CLEARFIELD	UT
2023-06-15	385-680	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - UT	7530	CLEARFIELD	UT
2023-06-15	385-681	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - UT	7530	CLEARFIELD	UT
2023-06-15	385-682	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - UT	7530	CLEARFIELD	UT
2023-06-12	385-540	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	AMERCNFORK	UT
2023-06-09	385-536	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SALT LAKE	UT
2023-06-09	385-537	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	AMERCNFORK	UT
2023-05-31	385-534	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - UT	871E	MIDVALE	UT
2023-05-05	385-532	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	KAYSVILLE	UT
2023-05-04	385-531	0–9 XXXall 10 · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - UT	3231	SALT LAKE	UT
2023-04-13	385-530	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SALT LAKE	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.