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 562
T-MOBILE USA, INC. 99
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
2002-08-30 562-569 7XXX which blocks → T-MOBILE USA, INC. 6529 NORWALK CA
2002-08-30 562-644 not yet reported which blocks → T-MOBILE USA, INC. 6529 DOWNEY CA
2002-08-30 562-713 6XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 LA HABRA CA
2002-08-30 562-832 1XXX4XXX5XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PICORIVERA CA
2002-08-30 562-841 7XXX which blocks → T-MOBILE USA, INC. 6529 LAKEWOOD CA
2002-08-29 562-686 none assigned yet which blocks → T-MOBILE USA, INC. 6529 WHITTIER CA
2002-06-21 562-639 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PICORIVERA CA
2002-05-24 562-842 1XXX2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PICORIVERA CA
2001-11-07 562-328 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 WHITTIER CA
2001-09-11 562-682 not yet reported which blocks → T-MOBILE USA, INC. 6529 LONG BEACH CA
2001-07-12 562-607 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LONG BEACH CA
2001-05-14 562-572 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LONG BEACH CA
2001-04-25 562-291 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 DOWNEY CA
2001-04-25 562-338 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
2001-04-25 562-656 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PICORIVERA CA
2001-04-12 562-253 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LONG BEACH CA
2001-03-15 562-587 none assigned yet which blocks → T-MOBILE USA, INC. 6529 WHITTIER CA
— 562-208 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
— 562-209 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
— 562-212 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
— 562-225 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
— 562-230 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
— 562-234 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
— 562-235 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
— 562-244 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LONG BEACH CA
— 562-248 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
— 562-254 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LONG BEACH CA
— 562-284 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
— 562-314 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
— 562-316 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 LAKEWOOD CA
— 562-318 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 WHITTIER CA
— 562-374 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
— 562-387 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
— 562-388 0XXX2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 LONG BEACH CA
— 562-396 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DOWNEY CA
— 562-416 0XXX2XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DOWNEY CA
— 562-417 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 DOWNEY CA
— 562-418 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 DOWNEY CA
— 562-440 0XXX which blocks → T-MOBILE USA, INC. 6529 DOWNEY CA
— 562-441 0XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DOWNEY CA
— 562-449 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
— 562-503 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 NORWALK CA
— 562-541 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 LAKEWOOD CA
— 562-577 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LONG BEACH CA
— 562-704 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LONG BEACH CA
— 562-739 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 LAKEWOOD CA
— 562-755 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LAKEWOOD CA
— 562-824 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LONG BEACH CA
— 562-843 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LONG BEACH 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.