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
2015-08-31 870-916 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → YELCOT VIDEO GROUP, INC. - AR 398H CALICOROCK AR
2015-07-13 870-320 0XXX1XXX2XXX3XXX6XXX9XXX · 6 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 SHERIDAN AR
2015-07-13 870-669 0–9 XXXall 10 · 5 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 GLENWOOD AR
2015-07-13 870-893 9XXX which blocks → WINDSTREAM ARKANSAS, INC. 1691 FORDYCE AR
2015-07-13 870-982 3XXX4XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 DE QUEEN AR
2015-07-13 870-985 6XXX9XXX · 2 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 MOUNT IDA AR
2015-06-11 870-801 1XXX6XXX9XXX · 3 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 MARSHALL AR
2015-05-22 870-991 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 CARTHAGE AR
2015-05-22 870-993 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 DALARK AR
2015-04-20 870-712 2XXX3XXX4XXX9XXX · 3 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 GREEN FOR AR
2015-04-20 870-909 6XXX9XXX · 2 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 BERRYVILLE AR
2015-03-31 870-661 0XXX2XXX5XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 SPARKMAN AR
2015-03-12 870-651 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → METROPCS, INC. 5562 LAKE CITY AR
2015-03-12 870-973 3XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 BAY AR
2015-02-05 870-478 0XXX4XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 GILLHAM AR
2015-02-05 870-676 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J MIDWAY AR
2015-02-05 870-682 2XXX3XXX7XXX · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J ELAINE AR
2015-01-21 870-600 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - AR 196F ASHDOWN AR
2015-01-21 870-760 0XXX6XXX7XXX8XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J LOCKESBURG AR
2015-01-16 870-978 0XXX2XXX7XXX8XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J AMITY AR
2014-11-25 870-419 7XXX which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J PINE BLUFF AR
2014-11-24 870-606 0XXX2XXX3XXX7XXX8XXX · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J NOSPRINGHL AR
2014-06-05 870-232 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 6 holders which blocks → YELCOT VIDEO GROUP, INC. - AR 398H MT HOME AR
2014-01-03 870-402 3XXX which blocks → CSC VOICE, LLC 612K MIDWAY AR
2014-01-03 870-407 1XXX4XXX7XXX8XXX · 2 holders which blocks → CSC VOICE, LLC 612K MARVELL AR
2014-01-03 870-470 4XXX7XXX8XXX · 2 holders which blocks → CSC VOICE, LLC 612K MALLARD PT AR
2014-01-03 870-707 1XXX7XXX8XXX9XXX · 2 holders which blocks → CSC VOICE, LLC 612K LAKEVIEW AR
2014-01-03 870-708 3XXX8XXX · 2 holders which blocks → CSC VOICE, LLC 612K WALDO AR
2014-01-03 870-803 1XXX3XXX4XXX · 2 holders which blocks → CSC VOICE, LLC 612K BAY AR
2014-01-03 870-812 7XXX which blocks → TCA COMMUNICATIONS, LLC DBA SUDDENLINK COMM - AR 048G FLIPPIN AR
2013-12-12 870-303 0XXX3XXX7XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HAZEN AR
2013-11-15 870-808 0XXX4XXX5XXX8XXX · 3 holders which blocks → CSC VOICE, LLC 612K TUCKERMAN AR
2013-11-11 870-920 0XXX1XXX2XXX4XXX7XXX · 4 holders which blocks → AIRECAST, LLC - AR 240H WARREN AR
2013-11-08 870-701 0XXX1XXX3XXX4XXX5XXX · 2 holders which blocks → CSC VOICE, LLC 612K MT HOME AR
2013-10-29 870-296 none assigned yet which blocks → TCA COMMUNICATIONS, LLC DBA SUDDENLINK COMM - AR 048G BULLSHOALS AR
2013-10-29 870-444 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K EL DORADO AR
2013-10-29 870-471 none assigned yet which blocks → TCA COMMUNICATIONS, LLC DBA SUDDENLINK COMM - AR 048G GASSVILLE AR
2013-10-29 870-520 0–9 XXXall 10 · 3 holders which blocks → CSC VOICE, LLC 612K JONESBORO AR
2013-05-08 870-401 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 PINE BLUFF AR
2012-05-10 870-302 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HARRISON AR
2012-03-19 870-301 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUGUSTA AR
2012-01-31 870-412 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 MONTICELLO AR
2012-01-31 870-551 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 W MEMPHIS AR
2011-11-01 870-340 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JONESBORO AR
2011-10-25 870-206 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 JONESBORO AR
2011-08-24 870-300 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DERMOTT AR
2011-07-08 870-281 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BLYTHEVL AR
2011-06-02 870-280 0–9 XXXall 10 · 7 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 HARRISON AR
2011-03-22 870-742 0XXX2XXX7XXX · 3 holders which blocks → AT&T ENTERPRISES, LLC 516C STRONG AR
2010-12-20 870-724 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C GURDON 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.