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
2014-07-08 385-230 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 PROVO UT
2014-07-08 385-299 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 SALT LAKE UT
2014-07-07 385-519 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 CLEARFIELD UT
2014-06-26 385-405 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 OGDEN UT
2014-05-27 385-239 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KAYSVILLE UT
2014-04-21 385-217 0–9 XXXwhole prefix which blocks → ONVOY, LLC - UT 871E SALT LAKE UT
2014-04-21 385-404 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F PAYSON UT
2014-04-21 385-449 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F ALTA UT
2014-04-09 385-355 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2014-04-04 385-213 0–9 XXXwhole prefix which blocks → ONVOY, LLC - UT 871E SALT LAKE UT
2014-03-31 385-528 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2014-03-07 385-236 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2013-12-10 385-444 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - UT 871E SALT LAKE UT
2013-12-10 385-999 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - UT 871E SPANIHFORK UT
2013-11-11 385-235 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2013-11-11 385-375 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PROVO UT
2013-10-31 385-219 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J PROVO UT
2013-10-16 385-216 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2013-09-26 385-626 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
2013-09-17 385-887 0–9 XXXall 10 · 6 holders which blocks → QWEST CORPORATION 9636 MIDVALE UT
2013-08-28 385-288 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 OGDEN UT
2013-08-22 385-269 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F PLEASATGRV UT
2013-08-05 385-695 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J MIDVALE UT
2013-06-18 385-325 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F SPRINGVL UT
2013-05-16 385-220 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - UT 871E FARMINGTON UT
2013-02-27 385-265 0–9 XXXall 10 · 5 holders which blocks → FIRSTDIGITAL COMMUNICATIONS, LLC 716D AMERCNFORK UT
2013-02-13 385-224 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PROVO UT
2013-02-13 385-329 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PROVO UT
2013-02-13 385-335 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PROVO UT
2013-02-12 385-228 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2013-02-12 385-315 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2013-02-12 385-321 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2013-02-11 385-214 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2013-01-29 385-722 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SALT LAKE UT
2013-01-28 385-210 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2013-01-15 385-207 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2012-12-31 385-223 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PROVO UT
2012-11-20 385-222 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - UT 871E SALT LAKE UT
2012-11-20 385-333 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - UT 871E OGDEN UT
2012-11-20 385-777 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - UT 871E BOUNTIFUL UT
2012-11-20 385-800 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - UT 871E MURRAY UT
2012-11-20 385-888 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - UT 871E KAYSVILLE UT
2012-10-29 385-474 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 MURRAY UT
2012-06-22 385-345 0–9 XXXall 10 · 5 holders which blocks → QWEST CORPORATION 9636 LEHI UT
2012-06-07 385-336 0–9 XXXall 10 · 4 holders which blocks → FIRSTDIGITAL COMMUNICATIONS, LLC 716D LEHI UT
2012-05-29 385-374 0–9 XXXall 10 · 6 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7176 LEHI UT
2012-05-15 385-209 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2012-05-08 385-290 0–9 XXXall 10 · 5 holders which blocks → FIRSTDIGITAL COMMUNICATIONS, LLC 716D SALT LAKE UT
2012-05-08 385-312 0–9 XXXall 10 · 3 holders which blocks → FIRSTDIGITAL COMMUNICATIONS, LLC 716D PROVO UT
2012-04-16 385-414 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 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.