NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 314
SOUTHWESTERN BELL 255
NEW CINGULAR WIRELESS PCS, LLC - IL 101
T-MOBILE USA, INC. 94
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 53
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 51
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
— 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
— 314-485 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 CREVECOEUR MO
— 314-486 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CREVECOEUR MO
— 314-487 not yet reported which blocks → SOUTHWESTERN BELL 9533 MEHLVILLE MO
— 314-488 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 KIRKWOOD MO
— 314-489 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-490 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LADUE MO
— 314-491 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LADUE MO
— 314-492 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MO 093F ST LOUIS MO
— 314-493 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-494 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-495 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-496 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-497 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-498 2XXX3XXX4XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-501 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF MISSOURI, LLC - MO 225F SAPPINGTON MO
— 314-503 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-504 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-505 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-506 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-507 not yet reported which blocks → SPOK, INC. 6630 LADUE MO
— 314-508 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ST LOUIS MO
— 314-509 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ST LOUIS MO
— 314-510 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ST LOUIS MO
— 314-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
— 314-512 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-513 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 LADUE MO
— 314-514 4XXX5XXX which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-515 not yet reported which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-516 3XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-517 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-518 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-520 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
— 314-521 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-522 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO

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.