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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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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
— 501-590 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-592 not yet reported which blocks → ARKANSAS TEL. CO., INC. 1692 SCOTLAND AR
— 501-594 0XXX2XXX3XXX4XXX6XXX7XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 PARON 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.