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 501
SOUTHWESTERN BELL 165
NEW CINGULAR WIRELESS PCS, LLC - IL 86
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 54
LEVEL 3 COMMUNICATIONS, LLC - AR 48
T-MOBILE USA, INC. 42
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
— 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
— 501-481 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 TELECOM OF ARKANSAS, LLC - AR 7264 BRYANTCGVL AR
— 501-482 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 TELECOM OF ARKANSAS, LLC - AR 7264 FERNDALE AR
— 501-483 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 TELECOM OF ARKANSAS, LLC - AR 7264 PALARM AR
— 501-485 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 TELECOM OF ARKANSAS, LLC - AR 7264 PINNACLE AR
— 501-486 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 TELECOM OF ARKANSAS, LLC - AR 7264 SPRINGLAKE AR
— 501-487 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 TELECOM OF ARKANSAS, LLC - AR 7264 SYVNHLSHWD AR
— 501-490 9XXX which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-492 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AR 802C LITTLEROCK AR
— 501-504 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 CONWAY AR
— 501-505 0XXX4XXX6XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 CONWAY AR
— 501-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AR
— 501-513 7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 CONWAY AR
— 501-514 6XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 CONWAY AR
— 501-515 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-516 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-517 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-519 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-520 1XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 HOTSPRINGS AR
— 501-523 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 SCOTT AR
— 501-525 not yet reported which blocks → SOUTHWESTERN BELL 9533 HOTSPRINGS AR
— 501-526 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-529 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-534 0XXX1XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → LEVEL 3 TELECOM OF ARKANSAS, LLC - AR 7264 LITTLEROCK AR
— 501-537 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-538 3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
— 501-539 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-541 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-542 1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 SYVNHLSHWD AR
— 501-543 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 BENTON AR
— 501-547 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 HOTSPRINGS AR
— 501-551 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-553 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → LEVEL 3 TELECOM OF ARKANSAS, LLC - AR 7264 LITTLEROCK AR
— 501-554 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST AR
— 501-556 7XXX which blocks → WINDSTREAM ARKANSAS, INC. 1691 ROSE BUD AR
— 501-557 0XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 BAUXITE AR
— 501-558 7XXX which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-562 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-563 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-565 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-568 8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-569 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-570 6XXX which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-580 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-581 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 GREENBRIER AR
— 501-584 2XXX3XXX6XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-589 7XXX which blocks → WINDSTREAM ARKANSAS, INC. 1691 QUITMAN AR

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.