NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
WINDSTREAM COMMUNICATIONS, INC. - AR 34
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
2015-10-01 501-585 0–9 XXXall 10 · 7 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 CONWAY AR
2011-07-06 501-234 0–9 XXXall 10 · 3 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
2009-04-16 501-850 0–9 XXXall 10 · 2 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
2001-12-05 501-447 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
2001-11-07 501-552 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-220 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-222 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 WRIGHTSVL AR
— 501-252 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-320 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-364 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-367 3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 PINNACLE AR
— 501-392 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 SYVNHLSHWD AR
— 501-448 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 FERNDALE AR
— 501-457 1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 JACKSONVL AR
— 501-475 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 SPRINGLAKE AR
— 501-523 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 SCOTT AR
— 501-526 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-537 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-628 1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 CABOT AR
— 501-673 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 PINNACLE AR
— 501-682 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-687 3XXX4XXX7XXX which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-722 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 BENTON AR
— 501-734 8XXX9XXX · 2 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 PALARM AR
— 501-748 5XXX6XXX7XXX8XXX9XXX which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-852 9XXX which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 CONWAY AR
— 501-905 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-906 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-907 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-932 1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 CONWAY AR
— 501-943 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 BRYANTCGVL AR
— 501-975 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-978 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-992 6XXX7XXX8XXX9XXX · 2 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 SYVNHLSHWD AR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.