NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 19
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
2020-11-19 945-400 0–9 XXXall 10 · 3 holders which blocks → USFON, INC. - TX 473F FRISCO TX
2020-11-19 945-444 0–9 XXXall 10 · 2 holders which blocks → USFON, INC. - TX 473F GRANDPRARI TX
2020-11-19 945-500 0–9 XXXall 10 · 6 holders which blocks → USFON, INC. - TX 473F CARROLLTON TX
2020-11-19 945-666 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → USFON, INC. - TX 473F PALMER TX
2020-11-19 945-800 0–9 XXXall 10 · 4 holders which blocks → USFON, INC. - TX 473F PLANO TX
2020-11-19 945-900 0–9 XXXall 10 · 5 holders which blocks → USFON, INC. - TX 473F WAXAHACHIE TX
2020-11-19 979-465 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H ANGLETON TX
2020-11-18 256-821 not yet reported which blocks → SHELCOMM 0051 DECATUR AL
2020-11-18 320-442 1XXX2XXX4XXX8XXX9XXX · 4 holders which blocks → TEKSTAR COMMUNICATIONS, INC. 4156 LITCHFIELD MN
2020-11-18 331-345 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H NAPERVILLE IL
2020-11-18 480-674 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 PHOENIX AZ
2020-11-18 513-653 0–9 XXXall 10 · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J CINCINNATI OH
2020-11-18 559-844 0XXX1XXX2XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → FRACTEL, LLC 965H MIRANTPHST CA
2020-11-18 564-203 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J PT ANGELES WA
2020-11-18 564-524 1XXX3XXX5XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - WA 483E COPALIS WA
2020-11-18 605-409 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 6569 HARISBGTEA SD
2020-11-18 623-267 0–9 XXXall 10 · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J PHOENIX AZ
2020-11-18 701-607 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - ND 452F REYNOLDS ND
2020-11-18 701-714 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - ND 452F GARDNER ND
2020-11-18 782-838 not yet reported which blocks → Bell Mobility Aliant 329A Windsor —
2020-11-18 825-522 not yet reported which blocks → Bell Mobility 6574 Edmonton —
2020-11-18 878-895 0–9 XXXall 10 · 7 holders which blocks → TWILIO INTERNATIONAL, INC. 506J UNIONTOWN PA
2020-11-18 938-202 not yet reported which blocks → SHELCOMM 0051 ATHENS AL
2020-11-18 938-203 not yet reported which blocks → SHELCOMM 0051 HARTSELLE AL
2020-11-18 984-358 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NC 6324 CHAPELHILL NC
2020-11-18 989-381 1XXX which blocks → WINN TELEPHONE COMPANY DBA WINN TELECOM - MI 0127 BLANCHARD MI
2020-11-17 254-419 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 KILLEEN TX
2020-11-17 313-756 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DETROITZN1 MI
2020-11-17 346-451 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 HOUSTON TX
2020-11-17 346-455 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H HOUSTON TX
2020-11-17 386-844 1XXX2XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → TERRA NOVA TELECOM, INC. - FL 382G MAYO FL
2020-11-17 575-244 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 ROSWELL NM
2020-11-17 581-908 not yet reported which blocks → Videotron Ltd. 8306 Lambton —
2020-11-17 628-667 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H SAN RAFAEL CA
2020-11-17 727-387 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CLEARWATER FL
2020-11-17 873-674 not yet reported which blocks → Fibernetics Corporation 464D Perkins —
2020-11-17 873-675 not yet reported which blocks → Fibernetics Corporation 464D Quyon —
2020-11-17 873-676 not yet reported which blocks → Fibernetics Corporation 464D St-Pierre-de-Wakefield —
2020-11-17 941-667 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H SARASOTA FL
2020-11-17 945-777 0–9 XXXall 10 · 6 holders which blocks → TERRA NOVA TELECOM INC. 145J ANNA TX
2020-11-17 945-888 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TERRA NOVA TELECOM INC. 145J BLUE RIDGE TX
2020-11-17 945-999 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TERRA NOVA TELECOM INC. 145J BRISTOL TX
2020-11-16 256-823 not yet reported which blocks → SHELCOMM 0051 HUNTSVILLE AL
2020-11-16 279-206 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SO PLACER CA
2020-11-16 346-655 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - TX 903C ROSHARON TX
2020-11-16 346-767 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - TX 903C STAFFORD TX
2020-11-16 628-724 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H BELVEDERE CA
2020-11-16 737-366 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - TX 903C MILANO TX
2020-11-16 802-219 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - VT 451F WEATHESFLD VT
2020-11-16 820-346 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H ARROYOGRND CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.