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
— 501-766 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-767 not yet reported which blocks → SOUTHWESTERN BELL 9533 HOTSPRINGS AR
— 501-771 3XXX which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-776 not yet reported which blocks → SOUTHWESTERN BELL 9533 BENTON AR
— 501-778 not yet reported which blocks → SOUTHWESTERN BELL 9533 BENTON AR
— 501-779 8XXX which blocks → T-MOBILE USA, INC. 6529 LITTLEROCK AR
— 501-781 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 HOTSPRINGS AR
— 501-786 5XXX6XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-791 1XXX4XXX6XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-794 3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BENTON AR
— 501-796 1XXX9XXX · 2 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 VILONIA AR
— 501-798 1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 PINNACLE AR
— 501-801 not yet reported which blocks → LEVEL 3 TELECOM OF ARKANSAS, LLC - AR 7264 LITTLEROCK AR
— 501-803 2XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 PALARM AR
— 501-804 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AR
— 501-812 3XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-813 0XXX2XXX4XXX5XXX6XXX7XXX9XXX which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-815 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 JONESMILLS AR
— 501-819 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 SYVNHLSHWD AR
— 501-821 not yet reported which blocks → SOUTHWESTERN BELL 9533 FERNDALE AR
— 501-823 6XXX which blocks → LEVEL 3 TELECOM OF ARKANSAS, LLC - AR 7264 LITTLEROCK AR
— 501-825 0XXX2XXX3XXX4XXX5XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 GREERSFRRY AR
— 501-827 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SEARCY AR
— 501-828 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LITTLEROCK AR
— 501-830 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J FERNDALE AR
— 501-831 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-833 4XXX5XXX6XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SYVNHLSHWD AR
— 501-834 not yet reported which blocks → SOUTHWESTERN BELL 9533 SYVNHLSHWD AR
— 501-835 not yet reported which blocks → SOUTHWESTERN BELL 9533 SYVNHLSHWD AR
— 501-837 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-840 0XXX which blocks → SOUTHWESTERN BELL 9533 BENTON AR
— 501-842 6XXX7XXX which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 ENGLAND AR
— 501-843 not yet reported which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 CABOT AR
— 501-844 8XXX which blocks → SOUTHWESTERN BELL 9533 JONESMILLS AR
— 501-847 not yet reported which blocks → SOUTHWESTERN BELL 9533 BRYANTCGVL AR
— 501-849 5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 ENOLA AR
— 501-851 9XXX which blocks → SOUTHWESTERN BELL 9533 PALARM AR
— 501-852 9XXX which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 CONWAY AR
— 501-859 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
— 501-860 5XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 BENTON AR
— 501-862 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-865 not yet reported which blocks → CENTRAL ARKANSAS TEL. COOP., INC. 1697 BISMARCK AR
— 501-868 3XXX which blocks → SOUTHWESTERN BELL 9533 PINNACLE AR
— 501-882 not yet reported which blocks → SOUTHWESTERN BELL 9533 BEEBE AR
— 501-884 not yet reported which blocks → ARKANSAS TEL. CO., INC. 1692 FAIRFLD BY AR
— 501-887 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 HEBER SPG AR
— 501-888 9XXX which blocks → SOUTHWESTERN BELL 9533 SPRINGLAKE AR
— 501-889 9XXX which blocks → WINDSTREAM ARKANSAS, INC. 1691 PERRYVILLE AR
— 501-891 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 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.