NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 510
METROPCS, 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
2018-09-17 510-905 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 OKLD ALMD CA
2014-08-18 510-829 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 RICHMOND CA
2011-12-09 510-447 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 RICHMOND CA
2011-11-04 510-294 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 HAYWARD CA
2008-11-12 510-200 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 HAYWARD CA
2007-02-08 510-221 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 RICHMOND CA
2002-05-17 510-754 none assigned yet which blocks → METROPCS, INC. 5562 HAYWARD CA
2001-10-18 510-825 none assigned yet which blocks → METROPCS, INC. 5562 HAYWARD CA
2001-09-21 510-776 not yet reported which blocks → METROPCS, INC. 5562 RICHMOND CA
2001-09-21 510-938 not yet reported which blocks → METROPCS, INC. 5562 FRNK MAIN CA
2001-08-22 510-472 not yet reported which blocks → METROPCS, INC. 5562 OKLD MN-PD CA
2001-08-22 510-706 not yet reported which blocks → METROPCS, INC. 5562 HAYWARD CA
2001-05-17 510-952 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → METROPCS, INC. 5562 FRNK GRNLF CA
2001-04-20 510-689 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 OKLD FRTVL CA
2001-03-22 510-677 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 HAYWARD CA
2001-01-25 510-866 0XXX2XXX · 2 holders which blocks → METROPCS, INC. 5562 OKLD FRTVL CA
— 510-205 none assigned yet which blocks → METROPCS, INC. 5562 OKLD ALMD CA
— 510-209 none assigned yet which blocks → METROPCS, INC. 5562 HAYWARD CA
— 510-306 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 OKLD ALMD CA
— 510-376 none assigned yet which blocks → METROPCS, INC. 5562 FRNK MAIN CA
— 510-453 none assigned yet which blocks → METROPCS, INC. 5562 FRNK MAIN CA
— 510-469 0XXX2XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 OKLD MN-PD CA
— 510-484 1XXX9XXX which blocks → METROPCS, INC. 5562 OKLD MN-PD CA
— 510-485 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 OKLD FRTVL CA
— 510-543 0XXX1XXX2XXX · 2 holders which blocks → METROPCS, INC. 5562 OKLD MN-PD CA
— 510-551 9XXX which blocks → METROPCS, INC. 5562 OKLD MN-PD CA
— 510-575 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 OKLD MN-PD CA
— 510-593 2XXX which blocks → METROPCS, INC. 5562 OKLD MN-PD CA
— 510-681 0XXX2XXX which blocks → METROPCS, INC. 5562 OKLD MN-PD CA
— 510-682 0XXX1XXX2XXX · 3 holders which blocks → METROPCS, INC. 5562 OKLD ALMD CA
— 510-684 none assigned yet which blocks → METROPCS, INC. 5562 OKLD BKLY CA
— 510-692 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 OKLD TRNID CA
— 510-715 none assigned yet which blocks → METROPCS, INC. 5562 OKLD MN-PD CA
— 510-719 none assigned yet which blocks → METROPCS, INC. 5562 OKLD MN-PD CA
— 510-750 1XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 HAYWARD CA
— 510-755 8XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 HAYWARD CA
— 510-757 1XXX9XXX which blocks → METROPCS, INC. 5562 OKLD MN-PD CA
— 510-760 none assigned yet which blocks → METROPCS, INC. 5562 HAYWARD CA
— 510-772 none assigned yet which blocks → METROPCS, INC. 5562 OKLD MN-PD CA
— 510-798 none assigned yet which blocks → METROPCS, INC. 5562 OKLD TRNID CA
— 510-812 none assigned yet which blocks → METROPCS, INC. 5562 OKLD BKLY CA
— 510-827 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 OKLD MN-PD CA
— 510-858 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 OKLD MN-PD CA
— 510-872 2XXX which blocks → METROPCS, INC. 5562 OKLD ALMD CA
— 510-967 none assigned yet which blocks → METROPCS, INC. 5562 OKLD FRTVL CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.