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
— 501-671 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-672 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BENTON AR
— 501-673 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 PINNACLE AR
— 501-676 8XXX which blocks → SOUTHWESTERN BELL 9533 LONOKE AR
— 501-679 not yet reported which blocks → WINDSTREAM ARKANSAS, INC. 1691 GREENBRIER AR
— 501-680 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-681 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-682 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-683 8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-686 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-687 3XXX4XXX7XXX which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-688 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-690 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-691 3XXX4XXX5XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HEBER SPG AR
— 501-693 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 HOTSPRINGS AR
— 501-694 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
— 501-697 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CONWAY AR
— 501-700 not yet reported which blocks → AR
— 501-701 0XXX2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 HOTSPRINGS AR
— 501-707 3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR 7277 LITTLEROCK AR
— 501-708 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AR 7277 LITTLEROCK AR
— 501-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AR
— 501-716 7XXX8XXX which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-721 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX AR
— 501-722 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 BENTON AR
— 501-723 not yet reported which blocks → ARKANSAS TEL. CO., INC. 1692 SHIRLEY AR
— 501-724 none assigned yet which blocks → BRIGHTSPEED OF NORTHWEST ARKANSAS, LLC 1142 BALD KNOB AR
— 501-725 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
— 501-726 not yet reported which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 MCRAE AR
— 501-727 2XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 MORRILTON AR
— 501-728 1XXX which blocks → WINDSTREAM ARKANSAS, INC. 1691 PANGBURN AR
— 501-729 8XXX which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 JUDSONIA AR
— 501-730 not yet reported which blocks → SOUTHWESTERN BELL 9533 CONWAY AR
— 501-732 2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MALVERN AR
— 501-733 6XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CONWAY AR
— 501-734 8XXX9XXX · 2 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 PALARM AR
— 501-737 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J SCOTT AR
— 501-742 not yet reported which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 KENSETT AR
— 501-743 0XXX2XXX5XXX · 2 holders which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 CABOT AR
— 501-745 not yet reported which blocks → ARKANSAS TEL. CO., INC. 1692 CLINTON AR
— 501-748 5XXX6XXX7XXX8XXX9XXX which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-749 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-753 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-758 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-759 5XXX6XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 BIGELOW AR
— 501-760 0XXX5XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 HOTSPRINGS AR
— 501-762 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 HOTSPRINGS AR
— 501-763 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 HOTSPRINGS AR
— 501-764 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 CONWAY AR
— 501-765 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK 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.