NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
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
2018-10-19 331-243 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 LOMBARD IL
2018-10-19 331-246 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 LEMONT IL
2018-10-19 409-401 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - TX 903C BON WIER TX
2018-10-19 409-506 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - TX 903C BRONSON TX
2018-10-19 430-789 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → ONVOY, LLC - TX 903C UNCERTAIN TX
2018-10-19 430-835 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - TX 903C MARIETTA TX
2018-10-19 430-897 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - TX 903C NAPLES TX
2018-10-19 432-293 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - TX 903C EAST HOBBS TX
2018-10-19 432-666 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ONVOY, LLC - TX 903C ORLA TX
2018-10-19 432-777 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - TX 903C IMPERIAL TX
2018-10-19 435-254 0–9 XXXwhole prefix which blocks → ONVOY, LLC - UT 871E PORTAGE UT
2018-10-19 435-266 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - UT 871E LYNNDYL UT
2018-10-19 435-409 2XXX4XXX5XXX8XXX which blocks → ONVOY, LLC - UT 871E SCIPIO UT
2018-10-19 435-422 1XXX2XXX3XXX4XXX6XXX · 3 holders which blocks → ONVOY, LLC - UT 871E HOWELL UT
2018-10-19 435-447 0XXX4XXX7XXX which blocks → ONVOY, LLC - UT 871E FIELDING UT
2018-10-19 435-626 2XXX4XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - UT 871E SNOWVILLE UT
2018-10-19 435-923 2XXX3XXX4XXX5XXX which blocks → ONVOY, LLC - UT 871E THATCHER UT
2018-10-19 509-873 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KENNEWICK WA
2018-10-19 530-607 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J WHEATLAND CA
2018-10-19 651-360 0XXX1XXX2XXX3XXX4XXX7XXX9XXX · 6 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 RED WING MN
2018-10-19 682-278 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EULESS TX
2018-10-19 734-373 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
2018-10-19 734-450 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ANN ARBOR MI
2018-10-19 803-921 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - SC 548E EUTAWVILLE SC
2018-10-19 947-985 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G SOUTHFIELD MI
2018-10-18 217-926 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ARCOLA IL
2018-10-18 219-257 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CROWNPOINT IN
2018-10-18 346-369 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 BEACH CITY TX
2018-10-18 346-371 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 STAFFORD TX
2018-10-18 346-372 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX 7239 SPRING TX
2018-10-18 667-362 0–9 XXXwhole prefix which blocks → CORE COMMUNICATIONS, INC.- MD 2593 ANNAPOLIS MD
2018-10-18 667-627 0–9 XXXwhole prefix which blocks → CORE COMMUNICATIONS, INC.- MD 2593 ANNAPOLIS MD
2018-10-18 667-876 0–9 XXXwhole prefix which blocks → CORE COMMUNICATIONS, INC.- MD 2593 ANNAPOLIS MD
2018-10-18 816-937 0–9 XXXwhole prefix which blocks → AERIAL COMMUNICATIONS, INC. 6701 ST JOSEPH MO
2018-10-18 870-517 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 HARRISON AR
2018-10-18 936-286 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 CONROE TX
2018-10-18 985-296 0–9 XXXall 10 · 4 holders which blocks → ADVANCED TEL., INC. - LA 8839 MONTEGUT LA
2018-10-17 236-472 not yet reported which blocks → TELUS 8086 Campbell River —
2018-10-17 262-258 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF WISCONSIN, LLC - WI 227F WHITEWATER WI
2018-10-17 417-401 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 BOLIVAR MO
2018-10-17 458-355 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BEND OR
2018-10-17 469-580 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 GRANDPRARI TX
2018-10-17 816-312 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 CAMERON MO
2018-10-16 236-947 not yet reported which blocks → TELUS 8086 Port Coquitlam —
2018-10-16 239-264 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FORT MYERS FL
2018-10-16 407-784 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 ORLANDO FL
2018-10-16 667-382 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 WINGATE MD
2018-10-16 667-473 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 SOLOMONS MD
2018-10-16 667-545 0–9 XXXall 10 · 2 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 WARWICK MD
2018-10-16 667-727 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 SUDLERSVL MD

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.