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
— 314-485 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
— 314-523 not yet reported which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-524 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-525 5XXX which blocks → SOUTHWESTERN BELL 9533 SAPPINGTON MO
— 314-527 0XXX1XXX2XXX3XXX4XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 LADUE MO
— 314-529 0XXX1XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-531 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-533 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-534 8XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-535 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-537 not yet reported which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
— 314-538 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-539 1XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-540 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
— 314-541 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
— 314-542 8XXX which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-543 not yet reported which blocks → SOUTHWESTERN BELL 9533 SAPPINGTON 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.