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
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
2008-09-23 801-477 0–9 XXXall 10 · 3 holders which blocks → QWEST CORPORATION 9636 SPRINGVL UT
2008-02-26 801-432 0–9 XXXall 10 · 5 holders which blocks → QWEST CORPORATION 9636 MIDVALE UT
2007-12-28 801-285 0–9 XXXall 10 · 3 holders which blocks → QWEST CORPORATION 9636 MIDVALE UT
2006-12-13 801-341 0–9 XXXall 10 · 6 holders which blocks → QWEST CORPORATION 9636 LEHI UT
2006-07-07 801-753 0–9 XXXall 10 · 7 holders which blocks → QWEST CORPORATION 9636 LEHI UT
2006-06-21 801-878 0–9 XXXall 10 · 5 holders which blocks → QWEST CORPORATION 9636 MIDVALE UT
2005-05-24 801-827 0–9 XXXall 10 · 2 holders which blocks → QWEST CORPORATION 9636 OGDEN UT
2001-07-12 801-863 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
2001-06-12 801-422 none assigned yet which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-204 9XXX which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-212 9XXX which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-213 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-215 9XXX which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-220 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-221 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-222 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-223 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-224 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-225 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-226 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-227 4XXX9XXX which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-228 0XXX1XXX2XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-229 8XXX which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-233 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-234 0XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-235 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-236 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-237 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-238 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-239 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-240 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-245 0XXX9XXX which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-246 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-250 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-252 4XXX5XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-253 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-254 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-255 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-256 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-257 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-258 1XXX which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-260 2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-261 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-262 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-263 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-264 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-265 not yet reported which blocks → QWEST CORPORATION 9636 MURRAY UT
— 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

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.