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
— 501-281 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
— 501-354 not yet reported which blocks → SOUTHWESTERN BELL 9533 MORRILTON AR
— 501-355 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 TELECOM OF ARKANSAS, LLC - AR 7264 LITTLEROCK AR
— 501-358 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 CONWAY 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.