NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

360 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - IL 26
Rogers Communications Canada Inc. (Wireless) 23
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
— 870-536 not yet reported which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-537 0XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 JOINER AR
— 870-538 0XXX6XXX7XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 DERMOTT AR
— 870-539 3XXX4XXX5XXX7XXX9XXX · 3 holders which blocks → BRIGHTSPEED OF NORTHWEST ARKANSAS, LLC 1143 LEACHVILLE AR
— 870-540 5XXX which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-541 not yet reported which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-542 4XXX which blocks → WALNUT HILL TEL. CO. 1729 FOREMAN AR
— 870-543 none assigned yet which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-544 0XXX3XXX4XXX5XXX8XXX · 3 holders which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 POLLARD AR
— 870-545 1XXX which blocks → WINDSTREAM ARKANSAS, INC. 1691 RUDD AR
— 870-546 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 NORPHLET AR
— 870-547 not yet reported which blocks → SOUTHWEST ARKANSAS TEL. COOP., INC. 1724 EMERSON AR
— 870-548 5XXX8XXX · 2 holders which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 GILLETT AR
— 870-550 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 PINE BLUFF AR
— 870-552 0XXX2XXX4XXX6XXX8XXX · 4 holders which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 CARLISLE AR
— 870-553 not yet reported which blocks → TRI-COUNTY TEL. CO., INC. 1726 OSAGE AR
— 870-554 0XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 MOUNTHOLLY AR
— 870-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST AR
— 870-556 7XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J PINE BLUFF AR
— 870-558 0–9 XXXall 10 · 8 holders which blocks → NUSO, LLC 732J JONESBORO AR
— 870-561 0XXX2XXX5XXX6XXX7XXX · 3 holders which blocks → BRIGHTSPEED OF NORTHWEST ARKANSAS, LLC 1143 MANILA AR
— 870-563 0XXX which blocks → SOUTHWESTERN BELL 9533 OSCEOLA AR
— 870-564 0XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 DELL AR
— 870-566 4XXX5XXX7XXX9XXX · 3 holders which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 BLOOMNGGRV AR
— 870-567 not yet reported which blocks → WINDSTREAM ARKANSAS, INC. 1691 CROSSETT AR
— 870-572 0XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 HELENA AR
— 870-573 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 PARAGOULD AR
— 870-574 7XXX which blocks → SOUTHWESTERN BELL 9533 CAMDEN AR
— 870-575 2XXX3XXX which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-576 0–9 XXXall 10 · 9 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 OSCEOLA AR
— 870-577 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 HARRISON AR
— 870-578 0XXX3XXX6XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 HARRISBURG AR
— 870-579 8XXX9XXX which blocks → RICE BELT TEL. CO. 1721 WALDENBURG AR
— 870-580 5XXX6XXX9XXX · 3 holders which blocks → CSC VOICE, LLC 612K MT HOME AR
— 870-581 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 FORREST CY AR
— 870-582 none assigned yet which blocks → WINDSTREAM ARKANSAS, INC. 1691 DE QUEEN AR
— 870-583 9XXX which blocks → WINDSTREAM ARKANSAS, INC. 1691 UMPIRE AR
— 870-584 none assigned yet which blocks → WINDSTREAM ARKANSAS, INC. 1691 DE QUEEN AR
— 870-585 not yet reported which blocks → MOUNTAIN VIEW TELEPHONE COMPANY 1712 ALLISON AR
— 870-586 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 PARAGOULD AR
— 870-587 0–9 XXXall 10 · 8 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AR 802C WYNNE AR
— 870-588 8XXX which blocks → SOUTHWESTERN BELL 9533 CHERRY VLY AR
— 870-589 5XXX which blocks → SOUTHWESTERN BELL 9533 BRINKLEY AR
— 870-591 not yet reported which blocks → MOUNTAIN VIEW TELEPHONE COMPANY 1712 SUNNYLAND AR
— 870-593 not yet reported which blocks → E. RITTER TEL. CO. 1722 PAYNEWAY AR
— 870-595 5XXX6XXX8XXX · 3 holders which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 RECTOR AR
— 870-596 0XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 VILLAGE AR
— 870-597 3XXX5XXX7XXX · 3 holders which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 MARMADUKE AR
— 870-598 none assigned yet which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 PIGGOTT AR
— 870-599 1XXX3XXX7XXX · 3 holders which blocks → BRIGHTSPEED OF SOUTH ARKANSAS, LLC 1727 DODGE CITY AR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.