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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 314-345 0XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-346 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-348 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-351 8XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-352 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-353 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-355 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-359 6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-360 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LADUE MO
— 314-361 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-362 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-363 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-364 not yet reported which blocks → SOUTHWESTERN BELL 9533 SAPPINGTON MO
— 314-365 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-367 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-368 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-369 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-371 5XXX6XXX7XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-372 1XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 LADUE MO
— 314-373 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J LADUE MO
— 314-374 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-375 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J OAKVILLE MO
— 314-377 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MO 093F LADUE MO
— 314-378 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
— 314-380 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ONVOY, LLC - MO 093F OAKVILLE MO
— 314-381 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-382 8XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-383 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-385 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-387 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 LADUE MO
— 314-388 8XXX which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-389 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-391 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 ST LOUIS MO
— 314-392 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 CREVECOEUR MO
— 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

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.