NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
— 501-590 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
— 501-596 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JACKSONVL AR
— 501-602 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 BAUXITE AR
— 501-603 none assigned yet which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-604 7XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
— 501-605 none assigned yet which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 CABOT AR
— 501-606 5XXX7XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CABOT AR
— 501-607 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-609 not yet reported which blocks → SOUTHWESTERN BELL 9533 HOTSPRINGS AR
— 501-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AR
— 501-612 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-614 0XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-615 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-617 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 HOTSPRINGS AR
— 501-618 0XXX1XXX5XXX6XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-620 none assigned yet which blocks → SOUTHWESTERN BELL 9533 HOTSPRINGS AR
— 501-621 0XXX1XXX2XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → TELNYX LLC 073H LITTLEROCK AR
— 501-622 not yet reported which blocks → SOUTHWESTERN BELL 9533 HOTSPRINGS AR
— 501-623 not yet reported which blocks → SOUTHWESTERN BELL 9533 HOTSPRINGS AR
— 501-624 not yet reported which blocks → SOUTHWESTERN BELL 9533 HOTSPRINGS AR
— 501-625 0XXX1XXX2XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 HOTSPRINGS AR
— 501-626 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-627 not yet reported which blocks → SOUTHWESTERN BELL 9533 HOTSPRINGS AR
— 501-628 1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 CABOT AR
— 501-629 0XXX9XXX · 2 holders which blocks → HD CARRIER LLC 321J LITTLEROCK AR
— 501-630 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 TELECOM OF ARKANSAS, LLC - AR 7264 LITTLEROCK AR
— 501-640 1XXX which blocks → TON80 COMMUNICATIONS, LLC 516J LITTLEROCK AR
— 501-641 6XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-642 0XXX1XXX2XXX3XXX8XXX9XXX which blocks → ONVOY, LLC - AR 348F LITTLEROCK AR
— 501-643 6XXX which blocks → TWILIO INTERNATIONAL, INC. 506J LITTLEROCK AR
— 501-644 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-645 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MORRILTON AR
— 501-646 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-647 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-648 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-652 2XXX3XXX4XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MORRILTON AR
— 501-653 3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BRYANTCGVL AR
— 501-654 none assigned yet which blocks → WINDSTREAM ARKANSAS, INC. 1691 MORGANTON AR
— 501-655 none assigned yet which blocks → METROPCS, INC. 5562 HOTSPRINGS AR
— 501-658 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-660 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-661 5XXX which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-662 3XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 PERRY AR
— 501-663 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-664 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-665 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 5 holders which blocks → COMMIO, LLC 939H LITTLEROCK AR
— 501-666 none assigned yet which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-669 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 CLEVELAND AR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.