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 512
T-MOBILE USA, INC. 70
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
2014-10-20 512-214 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SAN MARCOS TX
2014-08-12 512-893 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2013-06-20 512-375 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2012-11-21 512-998 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2008-08-04 512-758 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2007-12-05 512-650 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2007-11-06 512-903 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2007-07-13 512-909 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2006-11-21 512-287 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2006-08-31 512-584 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2006-06-20 512-709 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2006-06-20 512-961 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2005-04-21 512-905 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2002-11-14 512-203 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2002-06-05 512-566 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 LAMPASAS TX
2002-04-04 512-577 not yet reported which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2002-01-31 512-269 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 TAYLOR TX
2001-11-27 512-769 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2001-10-02 512-786 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2001-04-24 512-587 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2001-04-24 512-619 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2001-02-27 512-563 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
2001-01-25 512-887 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 GEORGETOWN TX
2001-01-08 512-586 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-200 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-293 not yet reported which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-294 2XXX which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-296 2XXX which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-297 2XXX which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-350 2XXX which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-400 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BUDA TX
— 512-507 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-508 7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 GEORGETOWN TX
— 512-521 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BASTROP TX
— 512-525 2XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 LAMPASAS TX
— 512-554 not yet reported which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-573 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-576 not yet reported which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-635 none assigned yet which blocks → T-MOBILE USA, INC. 6529 GEORGETOWN TX
— 512-644 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 SAN MARCOS TX
— 512-653 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-665 not yet reported which blocks → T-MOBILE USA, INC. 6529 SAN MARCOS TX
— 512-677 3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 GEORGETOWN TX
— 512-680 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-698 not yet reported which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-731 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-736 not yet reported which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-738 3XXX4XXX5XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SAN MARCOS TX
— 512-740 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX
— 512-743 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUSTIN TX

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.