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
— 314-544 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-545 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 LADUE MO
— 314-548 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → AT&T - LOCAL 7421 CREVECOEUR MO
— 314-549 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 OAKVILLE MO
— 314-550 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
— 314-551 2XXX6XXX7XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-552 1XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-553 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-554 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST MO
— 314-558 3XXX7XXX8XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 ST LOUIS MO
— 314-559 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ST LOUIS MO
— 314-560 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
— 314-562 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
— 314-563 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 LADUE MO
— 314-564 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-565 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
— 314-567 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-568 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CREVECOEUR MO
— 314-569 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-570 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
— 314-571 0XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-572 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-574 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
— 314-575 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CREVECOEUR MO
— 314-576 not yet reported which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-577 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-578 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
— 314-579 3XXX which blocks → SOUTHWESTERN BELL 9533 CREVECOEUR MO
— 314-580 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-581 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CREVECOEUR MO
— 314-583 not yet reported which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
— 314-584 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MO 093F ST LOUIS MO
— 314-587 0XXX5XXX6XXX9XXX which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-588 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-589 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-590 3XXX5XXX6XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J CREVECOEUR MO
— 314-591 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LADUE MO
— 314-592 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-593 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 LADUE MO
— 314-594 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 CREVECOEUR MO
— 314-595 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-596 1XXX2XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 KIRKWOOD MO
— 314-598 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 LADUE MO
— 314-599 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
— 314-600 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
— 314-601 1XXX2XXX3XXX4XXX5XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-602 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
— 314-603 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
— 314-604 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD 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.