NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

338 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, last 30 days
8X8, INC. 38
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
2023-02-17 515-301 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J AMES IA
2023-02-17 539-273 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J MUSKOGEE OK
2023-02-17 561-608 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J BOCA RATON FL
2023-02-17 572-212 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J EDMOND OK
2023-02-17 639-542 not yet reported which blocks → Access Communications Co-operative Limited 280H Strasbourg —
2023-02-17 639-543 not yet reported which blocks → Access Communications Co-operative Limited 280H Glaslyn —
2023-02-17 661-604 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LANCASTER CA
2023-02-17 681-449 0XXX1XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WV 9944 WILLIAMSTN WV
2023-02-17 681-450 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WV 9944 MONTGOMERY WV
2023-02-17 689-294 0–9 XXXwhole prefix which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 ORLANDO FL
2023-02-17 689-295 0–9 XXXwhole prefix which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 ORLANDO FL
2023-02-17 707-905 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LOWER LAKE CA
2023-02-17 712-416 0XXX1XXX2XXX3XXX8XXX · 5 holders which blocks → NUSO, LLC 732J CHEROKEE IA
2023-02-17 712-417 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J COUNCILBLF IA
2023-02-17 737-387 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C SAN MARCOS TX
2023-02-17 804-797 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WEST POINT VA
2023-02-17 828-530 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 HICKORY NC
2023-02-17 848-347 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - NJ 637C FRANKLINPK NJ
2023-02-17 913-421 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BONNER SPG KS
2023-02-17 929-664 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN05 NY
2023-02-17 929-665 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN08 NY
2023-02-17 936-693 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C CONROE TX
2023-02-17 940-510 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUBREY TX
2023-02-17 980-410 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NC 998E ALBEMARLE NC
2023-02-16 254-658 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 KILLEEN TX
2023-02-16 254-737 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX which blocks → NUSO, LLC 732J WACO TX
2023-02-16 269-401 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BATTLE CRK MI
2023-02-16 316-203 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J WICHITA KS
2023-02-16 325-318 0XXX1XXX2XXX3XXX8XXX9XXX · 2 holders which blocks → NUSO, LLC 732J SNYDER TX
2023-02-16 341-225 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK GRNLF CA
2023-02-16 341-227 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK OLIVR CA
2023-02-16 346-619 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J HOUSTON TX
2023-02-16 361-357 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J C CHRISTI TX
2023-02-16 386-367 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J DAYTONABCH FL
2023-02-16 409-304 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J PORTARTHUR TX
2023-02-16 430-323 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J LONGVIEW TX
2023-02-16 432-318 1XXX2XXX3XXX4XXX5XXX · 2 holders which blocks → NUSO, LLC 732J MIDLAND TX
2023-02-16 447-248 9XXX which blocks → BOOST SUBSCRIBERCO L.L.C. 490J ASHLAND IL
2023-02-16 447-249 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MATTOON IL
2023-02-16 682-399 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 732J FORT WORTH TX
2023-02-16 726-231 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J SANANTONIO TX
2023-02-16 726-234 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 SANANTONIO TX
2023-02-16 731-210 1XXX which blocks → CHARTER IP ENABLED SERVICES, LLC 792K COTTAGEGRV TN
2023-02-16 737-354 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J AUSTIN TX
2023-02-16 785-402 0XXX1XXX2XXX3XXX4XXX · 2 holders which blocks → NUSO, LLC 732J LAWRENCE KS
2023-02-16 825-936 not yet reported which blocks → Fibernetics Corporation 464D Longview —
2023-02-16 825-937 not yet reported which blocks → Fibernetics Corporation 464D Milo —
2023-02-16 825-938 not yet reported which blocks → Fibernetics Corporation 464D Morley —
2023-02-16 825-939 not yet reported which blocks → Fibernetics Corporation 464D Nanton —
2023-02-16 825-940 not yet reported which blocks → Fibernetics Corporation 464D Rockyford —

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.