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
— 501-278 4XXX which blocks → SOUTHWESTERN BELL 9533 SEARCY AR
— 501-279 not yet reported which blocks → SOUTHWESTERN BELL 9533 SEARCY AR
— 501-280 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-281 not yet reported which blocks → SOUTHWESTERN BELL 9533 SEARCY AR
— 501-282 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
— 501-292 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - AR 348F BALD KNOB AR
— 501-296 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-297 2XXX3XXX5XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-299 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 KENSETT AR
— 501-301 0XXX4XXX which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-303 0XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 BENTON AR
— 501-305 0XXX1XXX2XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SEARCY AR
— 501-307 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - AR 348F LITTLEROCK AR
— 501-309 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H LITTLEROCK AR
— 501-310 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LITTLEROCK AR
— 501-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AR
— 501-312 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-315 6XXX8XXX which blocks → SOUTHWESTERN BELL 9533 BENTON AR
— 501-316 3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BENTON AR
— 501-317 0XXX1XXX which blocks → SOUTHWESTERN BELL 9533 BENTON AR
— 501-318 3XXX4XXX which blocks → SOUTHWESTERN BELL 9533 HOTSPRINGS AR
— 501-319 2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-320 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-321 not yet reported which blocks → SOUTHWESTERN BELL 9533 HOTSPRINGS AR
— 501-323 9XXX which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 GRIFFITHVL AR
— 501-324 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-325 none assigned yet which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 LITTLEROCK AR
— 501-327 not yet reported which blocks → SOUTHWESTERN BELL 9533 CONWAY AR
— 501-328 0XXX which blocks → SOUTHWESTERN BELL 9533 CONWAY AR
— 501-329 not yet reported which blocks → SOUTHWESTERN BELL 9533 CONWAY AR
— 501-330 0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 WYE AR
— 501-332 not yet reported which blocks → SOUTHWESTERN BELL 9533 MALVERN AR
— 501-333 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 MAUMELLE AR
— 501-334 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 SEARCY AR
— 501-335 2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → WINDSTREAM ARKANSAS, INC. 1691 DAMASCUS AR
— 501-336 not yet reported which blocks → SOUTHWESTERN BELL 9533 CONWAY AR
— 501-337 none assigned yet which blocks → SOUTHWESTERN BELL 9533 MALVERN AR
— 501-340 0XXX which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-341 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AR
— 501-342 not yet reported which blocks → SOUTHWESTERN BELL 9533 CONWAY AR
— 501-343 0XXX1XXX2XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H LITTLEROCK AR
— 501-344 6XXX which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 BRADFORD AR
— 501-345 7XXX which blocks → BRIGHTSPEED OF NORTHWEST ARKANSAS, LLC 1142 PLEASANTPL AR
— 501-346 0XXX1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 LITTLEROCK AR
— 501-347 0XXX which blocks → ONVOY SPECTRUM, LLC 624H LITTLEROCK AR
— 501-348 1XXX which blocks → T-MOBILE USA, INC. 6529 LITTLEROCK AR
— 501-349 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LITTLEROCK AR
— 501-350 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-351 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-352 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 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.