NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 27
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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 1XXX2XXX4XXX5XXX6XXX7XXX · 4 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
— 501-893 0XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CENTER RDG AR
— 501-897 3XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 WRIGHTSVL AR
— 501-902 3XXX4XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.