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 415
T-MOBILE USA, INC. 45
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
2024-02-14 415-718 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2024-01-11 415-791 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2015-08-03 415-619 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELVEDERE CA
2015-05-01 415-910 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELVEDERE CA
2014-11-11 415-650 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SNFC MT-EV CA
2014-10-20 415-966 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELVEDERE CA
2014-09-02 415-980 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SNFC JUNPR CA
2014-08-21 415-792 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2014-07-21 415-960 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 BELVEDERE CA
2013-09-26 415-610 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2012-11-29 415-231 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 SNFC MT-EV CA
2012-11-23 415-589 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2012-09-04 415-429 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2011-10-24 415-426 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2011-08-09 415-316 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELVEDERE CA
2010-11-26 415-815 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2002-09-19 415-612 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 IGNACIO CA
2002-09-19 415-690 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 BELVEDERE CA
2002-01-29 415-465 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 SAUSALITO CA
2001-12-26 415-299 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SAN RAFAEL CA
2001-12-26 415-320 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 NOVATO CA
2001-11-28 415-812 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNFC JUNPR CA
2001-10-18 415-425 not yet reported which blocks → T-MOBILE USA, INC. 6529 SNFC MT-EV CA
2001-10-18 415-867 not yet reported which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2001-05-18 415-286 2XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SNFC MT-EV CA
— 415-225 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
— 415-235 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
— 415-301 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 NOVATO CA
— 415-305 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
— 415-312 2XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
— 415-336 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
— 415-377 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
— 415-378 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
— 415-505 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
— 415-572 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
— 415-577 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
— 415-595 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
— 415-725 5XXX6XXX7XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SNFC MT-EV CA
— 415-726 1XXX2XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 SAN RAFAEL CA
— 415-740 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNFC JUNPR CA
— 415-747 1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SAN RAFAEL CA
— 415-797 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → T-MOBILE USA, INC. 6529 BELVEDERE CA
— 415-798 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 NOVATO CA
— 415-850 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
— 415-992 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA

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.