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 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
— 314-658 4XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-664 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-679 0XXX9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-692 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-693 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-694 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-702 0XXX1XXX3XXX7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-715 1XXX2XXX3XXX4XXX5XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-716 2XXX3XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-719 none assigned yet which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-721 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-725 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-726 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-727 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-729 not yet reported which blocks → SOUTHWESTERN BELL 9533 SAPPINGTON MO
— 314-730 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SAPPINGTON MO
— 314-731 6XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-738 1XXX3XXX4XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-739 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-741 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-746 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-747 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-752 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-758 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-762 1XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-763 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-765 5XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-767 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-768 0XXX3XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-769 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-770 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-771 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-772 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-773 9XXX which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-776 8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-781 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-810 2XXX4XXX6XXX7XXX9XXX which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-812 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-821 not yet reported which blocks → SOUTHWESTERN BELL 9533 KIRKWOOD MO
— 314-822 not yet reported which blocks → SOUTHWESTERN BELL 9533 KIRKWOOD MO
— 314-823 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-826 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-829 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-830 8XXX which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-831 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-832 not yet reported which blocks → SOUTHWESTERN BELL 9533 ST LOUIS MO
— 314-835 7XXX8XXX which blocks → SOUTHWESTERN BELL 9533 KIRKWOOD MO
— 314-837 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-838 not yet reported which blocks → SOUTHWESTERN BELL 9533 LADUE MO
— 314-839 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.