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
T-MOBILE USA, INC. 94
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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
— 314-374 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-393 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ST LOUIS 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
— 314-443 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-477 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-479 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-482 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-484 2XXX3XXX4XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-486 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CREVECOEUR 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
— 314-503 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
— 314-517 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
— 314-537 not yet reported which blocks → T-MOBILE USA, INC. 6529 ST LOUIS 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
— 314-568 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CREVECOEUR 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
— 314-581 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
— 314-599 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
— 314-629 not yet reported which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
— 314-637 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-643 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-662 5XXX7XXX which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-680 not yet reported which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
— 314-713 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CREVECOEUR MO
— 314-723 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ST LOUIS MO
— 314-749 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-757 8XXX which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-761 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-853 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-922 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LADUE MO
— 314-938 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 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.