NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

3 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, last 30 days — NPA 820
ONVOY, LLC - CA 2
NEW CINGULAR WIRELESS PCS, LLC 1
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
2022-02-18 820-426 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CAMARILLO CA
2022-02-16 820-209 0XXX7XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E GAVIOTA CA
2022-01-10 820-837 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J OXNARD CA
2021-09-22 820-822 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H OXNARD CA
2021-08-23 820-587 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H SANBARBARA CA
2021-08-05 820-432 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H NEWBURYPRK CA
2021-08-05 820-667 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H OXNARD CA
2021-08-05 820-786 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H ATASCADERO CA
2021-07-29 820-207 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CAMARILLO CA
2021-07-16 820-206 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 PASOROBLES CA
2021-07-01 820-204 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CAMARILLO CA
2021-07-01 820-205 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 NEWBURYPRK CA
2021-03-12 820-336 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H GUADALUPE CA
2021-03-11 820-203 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ATASCADERO CA
2021-01-27 820-288 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H VNTRA EAST CA
2021-01-27 820-299 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H CAMARILLO CA
2021-01-13 820-356 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H POINT MUGU CA
2021-01-13 820-899 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H SANTAMARIA CA
2021-01-11 820-348 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H OXNARD CA
2020-11-16 820-346 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H ARROYOGRND CA
2020-11-04 820-842 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H OAKVIEW CA
2020-09-17 820-234 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H OXNARD CA
2020-07-10 820-465 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H OXNARD CA
2020-07-10 820-732 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H VNTRA CNTL CA
2020-07-10 820-758 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H SANBARBARA CA
2020-07-10 820-946 0–9 XXXall 10 · 8 holders which blocks → FRACTEL, LLC 965H SANTAMARIA CA
2020-07-02 820-345 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H EL RIO CA
2020-02-13 820-202 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → CSC WIRELESS, LLC 425J SNLUSOBSPO CA
2019-12-17 820-529 0XXX1XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H PIRU CA
2019-12-05 820-500 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H GAVIOTA CA
2019-12-05 820-600 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H PISMOBEACH CA
2019-12-05 820-800 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H CAYUCOS CA
2019-12-05 820-900 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H BRADLEY CA
2019-10-02 820-280 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → HD CARRIER LLC 321J LOS ALAMOS CA
2019-01-25 820-444 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H NEWBURYPRK CA
2019-01-24 820-666 0XXX2XXX3XXX4XXX6XXX8XXX · 4 holders which blocks → FRACTEL, LLC 965H SNLUSOBSPO CA
2019-01-23 820-222 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H CAMARILLO CA
2019-01-23 820-333 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H THOUSAOAKS CA
2019-01-22 820-777 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H SANTAPAULA CA
2019-01-22 820-999 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H OXNARD CA
2019-01-15 820-300 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C GUADALUPE CA
2018-12-24 820-888 0–9 XXXall 10 · 6 holders which blocks → TERRA NOVA TELECOM INC. 145J SIMIVALLEY CA
2018-07-31 820-201 not yet reported which blocks → SHELCOMM 0051 OXNARD CA
2018-06-25 820-200 0–9 XXXall 10 · 5 holders which blocks → ADVANCED TELECOM SOLUTIONS, LLC 181J THOUSAOAKS CA
— 820-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 820-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 820-400 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → TWILIO INTERNATIONAL, INC. 506J PARKFIELD CA
— 820-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 820-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 820-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST 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.