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
— 314-393 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
— 314-394 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K KIRKWOOD MO
— 314-397 7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-398 not yet reported which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
— 314-400 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - MO 093F LADUE MO
— 314-401 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
— 314-402 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
— 314-406 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
— 314-407 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LADUE MO
— 314-409 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
— 314-410 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF MISSOURI, LLC - MO 225F ST LOUIS MO
— 314-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
— 314-412 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-413 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-414 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E LADUE MO
— 314-415 0XXX1XXX2XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 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

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.