NumberResearch Membership · Data 09/22/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026

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 619
T-MOBILE USA, INC. 96
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
2007-10-27 619-569 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 EL CAJON CA
2007-03-08 619-534 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
2007-01-19 619-259 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 NATIONALCY CA
2006-01-06 619-638 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2005-08-01 619-623 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2005-06-28 619-565 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2005-02-02 619-632 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2005-02-02 619-793 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
2002-09-19 619-519 3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CORONADO CA
2002-03-21 619-675 0XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 CORONADO CA
2001-12-27 619-254 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2001-12-27 619-274 3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 NATIONALCY CA
2001-12-27 619-277 not yet reported which blocks → T-MOBILE USA, INC. 6529 EL CAJON CA
2001-09-19 619-347 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CORONADO CA
2001-09-19 619-549 not yet reported which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
2001-02-22 619-459 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CORONADO CA
— 619-214 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-218 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-227 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
— 619-247 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-248 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LA MESA CA
— 619-249 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL CAJON CA
— 619-251 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LA MESA CA
— 619-253 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
— 619-319 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CORONADO CA
— 619-352 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 NATIONALCY CA
— 619-368 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EL CAJON CA
— 619-376 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-379 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-384 0XXX which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-392 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
— 619-436 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-520 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-571 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-572 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-602 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-665 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-666 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-678 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
— 619-723 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-750 0XXX which blocks → T-MOBILE USA, INC. 6529 LA MESA CA
— 619-764 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SNDG SNDG CA
— 619-805 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 CORONADO CA
— 619-856 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 NATIONALCY CA
— 619-865 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CORONADO CA
— 619-867 0XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 LA MESA CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.