NumberResearch Membership · Data 09/23/2026

Recent prefix assignments

338 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/23/2026

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. 39
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - IL 27
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 15
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
— 870-538 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
— 870-607 none assigned yet which blocks → CSC VOICE, LLC 612K MALLARD PT AR
— 870-609 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CSC VOICE, LLC 612K POCAHONTAS AR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.