NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

360 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - IL 26
Rogers Communications Canada Inc. (Wireless) 23
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
Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 314-416 not yet reported which blocks → SOUTHWESTERN BELL 9533 MEHLVILLE MO
— 314-418 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-419 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LADUE MO
— 314-420 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
— 314-421 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-422 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
— 314-423 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-424 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LADUE MO
— 314-425 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-426 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-427 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-428 9XXX which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-429 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-431 3XXX4XXX6XXX7XXX8XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 SAPPINGTON MO
— 314-432 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-433 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 MEHLVILLE MO
— 314-434 not yet reported which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-435 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST LOUIS MO
— 314-436 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-438 2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-439 1XXX6XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-440 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-442 1XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 LADUE MO
— 314-443 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-444 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-445 1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-446 6XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J ST LOUIS MO
— 314-447 8XXX which blocks → PAETEC ITEL, LLC 829J LADUE MO
— 314-450 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → AT&T - LOCAL 7421 ST LOUIS MO
— 314-451 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 LADUE MO
— 314-453 2XXX3XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-454 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-455 0–9 XXXall 10 · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K LADUE MO
— 314-457 3XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-460 not yet reported which blocks → SPOK, INC. 6630 ST LOUIS MO
— 314-465 0XXX1XXX2XXX3XXX5XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-466 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-468 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 LADUE MO
— 314-469 not yet reported which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-471 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 KIRKWOOD MO
— 314-472 2XXX3XXX5XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 SAPPINGTON MO
— 314-473 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 LADUE MO
— 314-475 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - MO 093F LADUE MO
— 314-477 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-479 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-480 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-481 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-482 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-483 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ST LOUIS MO
— 314-484 2XXX3XXX4XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 LADUE MO

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.