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
2023-06-20 548-732 not yet reported which blocks → ISP Telecom Inc. 4727 St. George —
2023-06-20 682-281 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C KENNEDALE TX
2023-06-20 683-225 not yet reported which blocks → ISP Telecom Inc. 4727 Lafontaine —
2023-06-20 683-459 not yet reported which blocks → ISP Telecom Inc. 4727 Lefroy —
2023-06-20 945-296 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 FORNEY TX
2023-06-19 368-299 not yet reported which blocks → Fido Solutions Inc. 5643 Calgary —
2023-06-19 368-399 not yet reported which blocks → Fido Solutions Inc. 5643 Calgary —
2023-06-19 437-562 not yet reported which blocks → TELUS Integrated Communications 2782 Toronto —
2023-06-19 438-542 not yet reported which blocks → Videotron Ltd. 328F Montreal —
2023-06-19 579-393 not yet reported which blocks → Cooptel 818D Berthierville —
2023-06-16 308-288 1XXX2XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOLDREGE NE
2023-06-16 318-830 0XXX1XXX3XXX8XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H FARMERVL LA
2023-06-16 318-844 4XXX which blocks → ONVOY SPECTRUM, LLC 624H GIBSLAND LA
2023-06-16 321-471 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MELBOURNE FL
2023-06-16 352-230 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 OCALA FL
2023-06-16 365-359 not yet reported which blocks → Videotron Ltd. 328F St. Catharines-Thorold —
2023-06-16 442-405 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VTVL ADLN CA
2023-06-16 442-407 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PALM SPG CA
2023-06-16 442-409 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CALEXICO CA
2023-06-16 447-256 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHARLESTON IL
2023-06-16 548-389 not yet reported which blocks → Videotron Ltd. 328F Windsor —
2023-06-16 618-930 0XXX which blocks → COMMIO, LLC 939H CAIRO IL
2023-06-16 683-380 not yet reported which blocks → Videotron Ltd. 328F Barrie —
2023-06-16 772-292 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 PTST LUCIE FL
2023-06-15 223-319 0XXX2XXX which blocks → ONVOY, LLC - PA 547E MARIETTA PA
2023-06-15 223-321 2XXX which blocks → ONVOY, LLC - PA 547E DUNCANNON PA
2023-06-15 254-818 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KILLEEN TX
2023-06-15 276-301 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 NORTON VA
2023-06-15 346-705 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C CHANNELVW TX
2023-06-15 346-709 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C LEAGUECITY TX
2023-06-15 346-713 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C SMITHERSLK TX
2023-06-15 346-738 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C ALVIN TX
2023-06-15 385-678 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 CLEARFIELD UT
2023-06-15 385-679 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 CLEARFIELD UT
2023-06-15 385-680 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 CLEARFIELD UT
2023-06-15 385-681 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 CLEARFIELD UT
2023-06-15 385-682 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 CLEARFIELD UT
2023-06-15 423-387 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BRISTOL TN
2023-06-15 423-576 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 ELIZABTHTN TN
2023-06-15 434-340 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J CHARLOTSVL VA
2023-06-15 442-406 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VTVL APVY CA
2023-06-15 458-305 0XXX5XXX7XXX9XXX · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J STATELINE OR
2023-06-15 470-678 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 GAINESVL GA
2023-06-15 557-207 0–9 XXXall 10 · 4 holders which blocks → FIVE9, INC. 598J OAKVILLE MO
2023-06-15 559-857 0XXX which blocks → BOOST SUBSCRIBERCO L.L.C. 490J FRIANT CA
2023-06-15 582-242 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 REYNOLDSVL PA
2023-06-15 601-830 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 MERIDIAN MS
2023-06-15 712-505 0XXX2XXX4XXX5XXX · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J MOVILLE IA
2023-06-15 724-412 0–9 XXXall 10 · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J CANONSBURG PA
2023-06-15 725-305 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LAS VEGAS NV

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.