NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 801
QWEST CORPORATION 327
T-MOBILE USA, INC. 91
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 69
NEW CINGULAR WIRELESS PCS, LLC 62
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 50
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
— 801-266 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-267 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-268 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-269 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-270 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-271 not yet reported which blocks → SPOK, INC. 6630 SALT LAKE UT
— 801-272 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-273 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-274 4XXX which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-276 not yet reported which blocks → SPOK, INC. 6630 SALT LAKE UT
— 801-277 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-278 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-280 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-281 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-282 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-284 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-286 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MIDVALE UT
— 801-287 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-288 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-289 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SALT LAKE UT
— 801-290 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MURRAY UT
— 801-291 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 MURRAY UT
— 801-292 not yet reported which blocks → QWEST CORPORATION 9636 BOUNTIFUL UT
— 801-293 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-294 not yet reported which blocks → QWEST CORPORATION 9636 BOUNTIFUL UT
— 801-295 not yet reported which blocks → QWEST CORPORATION 9636 BOUNTIFUL UT
— 801-296 not yet reported which blocks → QWEST CORPORATION 9636 BOUNTIFUL UT
— 801-297 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-298 not yet reported which blocks → QWEST CORPORATION 9636 BOUNTIFUL UT
— 801-299 not yet reported which blocks → QWEST CORPORATION 9636 BOUNTIFUL UT
— 801-301 none assigned yet which blocks → T-MOBILE USA, INC. 6529 MURRAY UT
— 801-302 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-303 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SALT LAKE UT
— 801-304 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-305 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MURRAY UT
— 801-306 0–9 XXXwhole prefix which blocks → ONVOY, LLC - UT 871E MIDVALE UT
— 801-308 3XXX4XXX6XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J MIDVALE UT
— 801-309 2XXX which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
— 801-310 7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PROVO UT
— 801-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX UT
— 801-312 0XXX1XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-313 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-314 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-315 3XXX4XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 KAYSVILLE UT
— 801-316 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MIDVALE UT
— 801-317 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 OGDEN UT
— 801-318 1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-319 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PROVO UT
— 801-320 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-321 not yet reported which blocks → QWEST CORPORATION 9636 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.