NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

372 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/30/2026

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 27
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 501-359 0–9 XXXall 10 · 3 holders which blocks → E. RITTER COMMUNICATIONS, LLC 128L HOTSPRINGS AR
— 501-360 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LITTLEROCK AR
— 501-362 not yet reported which blocks → SOUTHWESTERN BELL 9533 HEBER SPG AR
— 501-364 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-367 3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 PINNACLE AR
— 501-368 5XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SEARCY AR
— 501-370 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-371 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-372 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-373 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-374 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-375 none assigned yet which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-376 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-377 9XXX which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-378 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-379 0XXX6XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-380 0–9 XXXall 10 · 5 holders which blocks → SOUTHWESTERN BELL 9533 SEARCY AR
— 501-384 not yet reported which blocks → CENTRAL ARKANSAS TEL. COOP., INC. 1697 DONALDSON AR
— 501-390 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LITTLEROCK AR
— 501-392 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 SYVNHLSHWD AR
— 501-395 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LITTLEROCK AR
— 501-396 6XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-397 0XXX1XXX3XXX4XXX8XXX9XXX · 2 holders which blocks → BRIGHTSPEED OF SOUTH CENTRAL ARKANSAS, LLC 1720 REDFIELD AR
— 501-399 4XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-401 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VONAGE AMERICA LLC 197D LITTLEROCK AR
— 501-405 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LITTLEROCK AR
— 501-407 1XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AR
— 501-412 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-413 2XXX3XXX4XXX5XXX6XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-416 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-421 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
— 501-423 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
— 501-425 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-432 2XXX3XXX4XXX7XXX9XXX · 4 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 NIMROD AR
— 501-433 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-440 4XXX5XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 SO FOURCHE AR
— 501-448 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 FERNDALE AR
— 501-450 not yet reported which blocks → SOUTHWESTERN BELL 9533 CONWAY AR
— 501-454 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-455 9XXX which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-457 1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 JACKSONVL AR
— 501-463 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 HOTSPRINGS AR
— 501-465 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 CONWAY AR
— 501-467 1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 MALVERN AR
— 501-469 0XXX1XXX2XXX4XXX7XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H BIGELOW AR
— 501-470 5XXX6XXX7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 CONWAY AR
— 501-472 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CONWAY AR
— 501-475 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 SPRINGLAKE AR
— 501-477 0XXX1XXX3XXX4XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 MORRILTON AR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.