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 840
T-MOBILE USA, INC. 32
FRACTEL, LLC 26
ONVOY, LLC - CA 22
NEW CINGULAR WIRELESS PCS, LLC 17
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 12
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
2021-07-29 840-202 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 POMONA CA
2021-07-29 840-203 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 S BERNDINO CA
2021-07-29 840-204 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 S BERNDINO CA
2021-07-16 840-699 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H ONTARIO CA
2021-07-16 840-788 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H FONTANA CA
2021-07-15 840-300 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H REDLANDS CA
2021-07-15 840-799 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H RIALTO CA
2021-07-15 840-877 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H MARSHALL CA
2021-07-15 840-899 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H HIGHLAND CA
2021-07-15 840-977 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H CLAREMONT CA
2021-07-07 840-345 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H POMONA CA
2021-07-07 840-465 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H CHINO CA
2021-04-18 840-234 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H ARROWHEAD CA
2021-03-11 840-201 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FONTANA CA
2021-01-04 840-200 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H CHINO CA
2021-01-04 840-400 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H ONTARIO CA
2021-01-04 840-600 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H COLTON CA
2020-12-24 840-222 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H S BERNDINO CA
2020-12-24 840-333 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H POMONA CA
2020-12-24 840-444 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H ARROWHEAD CA
2020-12-24 840-666 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H FONTANA CA
2020-12-24 840-800 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H UPLAND CA
2020-12-24 840-900 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H RIALTO CA
2020-12-23 840-777 0–9 XXXall 10 · 4 holders which blocks → TERRA NOVA TELECOM INC. 145J POMONA CA
2020-12-23 840-888 0–9 XXXall 10 · 5 holders which blocks → TERRA NOVA TELECOM INC. 145J REDLANDS CA
2020-12-23 840-999 0–9 XXXall 10 · 5 holders which blocks → TERRA NOVA TELECOM INC. 145J UPLAND CA
— 840-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 840-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 840-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 840-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 840-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST CA
— 840-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 840-700 not yet reported which blocks → CA
— 840-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 840-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 840-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 840-950 not yet reported which blocks → CA
— 840-958 not yet reported which blocks → CA
— 840-959 not yet reported which blocks → CA
— 840-976 not yet reported which blocks → 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.