NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

355 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
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
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
2023-05-17 236-851 not yet reported which blocks → Fibernetics Corporation 464D Abbotsford —
2023-05-17 248-248 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H NORTHVILLE MI
2023-05-17 404-404 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H ATLANTA GA
2023-05-17 410-410 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H BALTIMORE MD
2023-05-17 437-441 not yet reported which blocks → Bell Mobility 6574 Toronto —
2023-05-17 548-452 not yet reported which blocks → Fibernetics Corporation 464D Guelph —
2023-05-17 580-930 0XXX1XXX2XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 SULPHUR OK
2023-05-17 619-619 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H RNCHOSANFE CA
2023-05-17 667-435 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MD 876D BALTIMORE MD
2023-05-17 678-678 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H CARROLLTON GA
2023-05-17 703-703 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H WSNGTNZN17 VA
2023-05-17 770-770 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H COVINGTON GA
2023-05-17 801-801 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H SALT LAKE UT
2023-05-17 828-715 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J MORGANTON NC
2023-05-16 343-630 not yet reported which blocks → Bell Mobility 6574 Ottawa-Hull —
2023-05-16 346-712 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C APOLLO TX
2023-05-16 430-214 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C MARSHALL TX
2023-05-16 438-470 not yet reported which blocks → Bell Mobility 6574 Montreal —
2023-05-16 438-576 not yet reported which blocks → Bell Mobility 6574 Montreal —
2023-05-16 443-667 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 DELMAR MD
2023-05-16 501-532 0XXX1XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 JESSIEVL AR
2023-05-16 512-254 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C AUSTIN TX
2023-05-16 656-218 0–9 XXXall 10 · 3 holders which blocks → FIVE9, INC. 598J TAMPACEN FL
2023-05-16 661-612 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J BKFD MAIN CA
2023-05-16 681-304 0–9 XXXall 10 · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J MORGANTOWN WV
2023-05-16 682-254 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C EULESS TX
2023-05-16 771-232 0–9 XXXall 10 · 3 holders which blocks → FIVE9, INC. 598J WSHNGTNZN1 DC
2023-05-16 816-573 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MO 093F KANSASCITY MO
2023-05-16 820-216 0–9 XXXall 10 · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J ARROYOGRND CA
2023-05-16 945-293 0–9 XXXall 10 · 3 holders which blocks → FIVE9, INC. 598J DALLAS TX
2023-05-15 367-329 not yet reported which blocks → Bell Mobility 6574 Quebec —
2023-05-15 431-954 not yet reported which blocks → Bell Mobility 6574 Winnipeg —
2023-05-15 437-440 not yet reported which blocks → Bell Mobility 6574 Toronto —
2023-05-15 505-571 0XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ABIQUIU NM
2023-05-15 505-581 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - NM 206F ALBUQURQUE NM
2023-05-15 513-775 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OH 464C BETHANY OH
2023-05-15 513-776 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OH 464C CINCINNATI OH
2023-05-15 548-397 not yet reported which blocks → Iristel Inc. 154E Woodstock —
2023-05-15 557-557 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MO 093F ST LOUIS MO
2023-05-15 572-572 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OK 409F OKLA CITY OK
2023-05-15 573-918 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIRCH TREE MO
2023-05-15 615-615 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H SPENCERMIL TN
2023-05-15 689-306 0–9 XXXall 10 · 4 holders which blocks → FIVE9, INC. 598J ORLANDO FL
2023-05-15 704-704 0–9 XXXwhole prefix which blocks → ONVOY, LLC - NC 638E GASTONIA NC
2023-05-15 704-803 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - NC 638E MONROE NC
2023-05-15 704-828 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - NC 638E SALISBURY NC
2023-05-15 715-242 2XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 AMERY WI
2023-05-15 740-712 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OH 464C ZANESVILLE OH
2023-05-15 772-280 0–9 XXXall 10 · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J STUART FL
2023-05-15 908-584 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FIVE9, INC. 598J SOMERVILLE NJ

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.