NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

2 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 442
NEW CINGULAR WIRELESS PCS, LLC 1
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 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
2021-03-05 442-386 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H VICTORVL CA
2021-03-01 442-799 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H TWNTYNPLMS CA
2020-12-30 442-667 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → FRACTEL, LLC 965H INYOKERN CA
2020-12-21 442-899 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H WARNER SPG CA
2020-12-16 442-349 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ESCONDIDO CA
2020-12-16 442-351 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ESCONDIDO CA
2020-12-16 442-352 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PALM SPG CA
2020-12-09 442-344 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VICTORVL CA
2020-12-01 442-343 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 VICTORVL CA
2020-11-30 442-342 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J PALM SPG CA
2020-11-27 442-341 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ESCONDIDO CA
2020-11-23 442-340 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BRAWLEY CA
2020-11-13 442-335 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PALM SPG CA
2020-11-13 442-338 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PALM SPG CA
2020-11-11 442-683 2XXX6XXX which blocks → TON80 COMMUNICATIONS, LLC 516J HOMESTDVLY CA
2020-11-09 442-699 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H TRONA CA
2020-11-09 442-833 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H JOSHUATREE CA
2020-11-09 442-955 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H VICTORVL CA
2020-11-06 442-744 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRACTEL, LLC 965H BRIDGEPORT CA
2020-11-06 442-966 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H RIDGECREST CA
2020-09-23 442-524 0–9 XXXall 10 · 4 holders which blocks → TWILIO INTERNATIONAL, INC. 506J VTVL ADLN CA
2020-09-17 442-346 0XXX2XXX4XXX5XXX6XXX · 3 holders which blocks → FRACTEL, LLC 965H BENTON CA
2020-09-17 442-388 0XXX1XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H DESERT CTR CA
2020-09-17 442-399 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H EL MIRAGE CA
2020-09-17 442-432 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H CALEXICO CA
2020-09-17 442-488 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H ESCONDIDO CA
2020-09-17 442-499 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H FORT IRWIN CA
2020-09-17 442-588 0XXX1XXX5XXX8XXX · 3 holders which blocks → FRACTEL, LLC 965H HOMESTDVLY CA
2020-09-17 442-599 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H INDIO CA
2020-09-17 442-786 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H BLYTHE CA
2020-09-08 442-331 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ESCONDIDO CA
2020-09-08 442-332 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PALM SPG CA
2020-08-13 442-329 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ESCONDIDO CA
2020-07-10 442-688 0XXX4XXX8XXX · 3 holders which blocks → FRACTEL, LLC 965H PALO VERDE CA
2020-07-02 442-322 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BRAWLEY CA
2020-06-29 442-320 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D ENCINITAS CA
2020-06-05 442-732 0XXX1XXX2XXX5XXX7XXX · 3 holders which blocks → FRACTEL, LLC 965H SANDY VLLY CA
2020-05-29 442-356 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H VTVL HSPR CA
2020-05-29 442-422 1XXX2XXX7XXX · 3 holders which blocks → FRACTEL, LLC 965H SHOSHONE CA
2020-05-29 442-477 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H RIDGECREST CA
2020-05-29 442-577 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H PAUMA VLY CA
2020-05-29 442-677 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H PALMDESERT CA
2020-05-29 442-758 0XXX3XXX6XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H OLANCHA CA
2020-05-29 442-766 0XXX2XXX3XXX5XXX6XXX7XXX · 5 holders which blocks → FRACTEL, LLC 965H INYOKERN CA
2020-05-29 442-788 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H DSERTHTSPG CA
2020-05-29 442-842 1XXX4XXX5XXX · 3 holders which blocks → FRACTEL, LLC 965H INDEPNDNCE CA
2020-05-29 442-877 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H ESCONDIDO CA
2020-05-29 442-946 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 5 holders which blocks → FRACTEL, LLC 965H EARP LSLK CA
2020-05-13 442-319 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CALIFORNCY CA
2020-04-24 442-317 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 ESCONDIDO 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.