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 870
SOUTHWESTERN BELL 154
NEW CINGULAR WIRELESS PCS, LLC - IL 105
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 85
WINDSTREAM ARKANSAS, INC. 72
LEVEL 3 COMMUNICATIONS, LLC - AR 47
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
— 870-722 0XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 HOPE AR
— 870-725 5XXX6XXX7XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SMACKOVER AR
— 870-728 6XXX which blocks → CSC VOICE, LLC 612K MARVELL AR
— 870-729 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 HOPE AR
— 870-730 3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-731 1XXX3XXX8XXX9XXX · 3 holders which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 MCCRORY AR
— 870-732 not yet reported which blocks → SOUTHWESTERN BELL 9533 W MEMPHIS AR
— 870-733 not yet reported which blocks → SOUTHWESTERN BELL 9533 W MEMPHIS AR
— 870-734 2XXX which blocks → SOUTHWESTERN BELL 9533 BRINKLEY AR
— 870-735 not yet reported which blocks → SOUTHWESTERN BELL 9533 W MEMPHIS AR
— 870-737 0XXX5XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 PORTLAND AR
— 870-739 0XXX6XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 MARION AR
— 870-740 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BLYTHEVL AR
— 870-741 not yet reported which blocks → WINDSTREAM ARKANSAS, INC. 1691 HARRISON AR
— 870-743 not yet reported which blocks → WINDSTREAM ARKANSAS, INC. 1691 HARRISON AR
— 870-744 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 TUPELO AR
— 870-746 not yet reported which blocks → MOUNTAIN VIEW TELEPHONE COMPANY 1712 TIMBO AR
— 870-747 7XXX8XXX · 2 holders which blocks → BRIGHTSPEED OF NORTHWEST ARKANSAS, LLC 1143 CLARENDON AR
— 870-748 0XXX4XXX5XXX7XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CALION AR
— 870-749 1XXX which blocks → WINDSTREAM ARKANSAS, INC. 1691 OAK GROVE AR
— 870-752 1XXX5XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BRINKLEY AR
— 870-753 2XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 HELENA AR
— 870-755 0XXX3XXX4XXX6XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 PARKIN AR
— 870-757 not yet reported which blocks → MOUNTAIN VIEW TELEPHONE COMPANY 1712 FIFTYSIX AR
— 870-759 3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 WALNUT RDG AR
— 870-761 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JONESBORO AR
— 870-762 not yet reported which blocks → SOUTHWESTERN BELL 9533 BLYTHEVL AR
— 870-763 not yet reported which blocks → SOUTHWESTERN BELL 9533 BLYTHEVL AR
— 870-764 not yet reported which blocks → E. RITTER TEL. CO. 1722 DYESS AR
— 870-765 9XXX which blocks → WINDSTREAM ARKANSAS, INC. 1691 LEOLA AR
— 870-766 2XXX3XXX6XXX7XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ALTHEIMER AR
— 870-768 0XXX2XXX3XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 MORO AR
— 870-769 1XXX3XXX4XXX5XXX7XXX · 4 holders which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 BIGGERS AR
— 870-770 1XXX3XXX4XXX5XXX7XXX · 2 holders which blocks → CSC VOICE, LLC 612K BAY AR
— 870-772 not yet reported which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 TEXARKANA AR
— 870-773 not yet reported which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 TEXARKANA AR
— 870-774 not yet reported which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 TEXARKANA AR
— 870-775 not yet reported which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 TEXARKANA AR
— 870-776 0XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BLYTHEVL AR
— 870-777 not yet reported which blocks → SOUTHWESTERN BELL 9533 HOPE AR
— 870-778 8XXX which blocks → TCA COMMUNICATIONS, LLC DBA SUDDENLINK COMM - AR 048G GASSVILLE AR
— 870-779 not yet reported which blocks → VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 1163 TEXARKANA AR
— 870-780 not yet reported which blocks → SOUTHWESTERN BELL 9533 BLYTHEVL AR
— 870-781 2XXX7XXX · 2 holders which blocks → BRIGHTSPEED OF NORTHWEST ARKANSAS, LLC 1143 BAY AR
— 870-786 2XXX3XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 STEPHENS AR
— 870-791 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CAMDEN AR
— 870-792 0XXX2XXX3XXX4XXX5XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 EARLE AR
— 870-793 not yet reported which blocks → SOUTHWESTERN BELL 9533 BATESVILLE AR
— 870-794 1XXX2XXX5XXX6XXX7XXX8XXX which blocks → SOUTHWESTERN BELL 9533 PINE BLUFF AR
— 870-797 none assigned yet which blocks → SOUTHWESTERN BELL 9533 STRONG 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.