NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

2 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 530
ONVOY, LLC - CA 2
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2022-10-03 530-874 0XXX1XXX2XXX · 3 holders which blocks → RACE TELECOMMUNICATIONS, INC. - CA 973E WILLIAMS CA
2022-10-03 530-920 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → RACE TELECOMMUNICATIONS, INC. - CA 973E GRVY MAIN CA
2022-09-23 530-930 0–9 XXXall 10 · 5 holders which blocks → RACE TELECOMMUNICATIONS, INC. - CA 973E MARYSVILLE CA
2022-08-25 530-843 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → HD CARRIER LLC 321J CORNING CA
2022-07-21 530-932 0XXX1XXX2XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ANDERSON CA
2022-06-29 530-705 0XXX4XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E CHALLENGE CA
2022-06-29 530-769 0XXX which blocks → COMMIO, LLC 939H HOOPA CA
2022-06-29 530-791 0–9 XXXall 10 · 2 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J ANDERSON CA
2022-06-29 530-808 0–9 XXXall 10 · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J DAVIS CA
2022-06-29 530-810 0–9 XXXall 10 · 5 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J BIGGS CA
2022-06-29 530-834 0XXX1XXX7XXX8XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J GRVY MAIN CA
2022-06-01 530-856 0XXX2XXX7XXX · 2 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CHICO CA
2022-05-26 530-610 0–9 XXXall 10 · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J REDDING CA
2022-03-21 530-929 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SHINGLESPG CA
2022-03-14 530-969 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J NTAH BCWY CA
2022-03-07 530-989 0XXX2XXX8XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J NORTH YUBA CA
2022-03-01 530-928 8XXX which blocks → TON80 COMMUNICATIONS, LLC 516J GERBER CA
2022-02-25 530-910 0XXX1XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J HAYFORK CA
2022-02-25 530-970 0XXX which blocks → TON80 COMMUNICATIONS, LLC 516J SODA SPG CA
2022-02-23 530-880 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ORLAND CA
2022-02-23 530-967 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J PLVL SOUTH CA
2022-02-18 530-942 0XXX1XXX2XXX6XXX9XXX · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J SIERRAVL CA
2022-02-14 530-860 0–9 XXXall 10 · 3 holders which blocks → COMMIO, LLC 939H OROVILLE CA
2022-02-10 530-716 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 OROVILLE CA
2021-11-22 530-875 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → TWILIO INTERNATIONAL, INC. 506J CHICO CA
2021-11-12 530-819 0XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E COLFAX CA
2021-10-01 530-850 0XXX8XXX · 2 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J VERDI CA
2021-09-21 530-857 1XXX8XXX9XXX · 2 holders which blocks → IP HORIZON LLC 515J CHICO CA
2021-08-31 530-780 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 REDDING CA
2021-08-25 530-704 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 WOODLAND CA
2021-08-23 530-785 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AUBN MAIN CA
2021-07-29 530-709 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MARYSVILLE CA
2021-07-27 530-697 0XXX1XXX9XXX · 3 holders which blocks → TELNYX LLC 073H MT SHASTA CA
2021-04-19 530-649 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LIVE OAK CA
2021-04-14 530-901 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H CHICO CA
2021-03-10 530-944 0XXX1XXX4XXX · 2 holders which blocks → FRACTEL, LLC 965H WILLOW CRK CA
2021-02-17 530-789 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H MARYSVILLE CA
2020-12-16 530-703 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 OROVILLE CA
2020-11-13 530-835 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → ONVOY, LLC - CA 649C NOSAN JUAN CA
2020-11-13 530-935 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C GEORGETOWN CA
2020-11-03 530-702 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 WOODLAND CA
2020-08-27 530-382 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AUBN MAIN CA
2020-07-21 530-614 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SHINGLESPG CA
2020-06-01 530-699 0XXX2XXX3XXX6XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H DUNNIGAN CA
2020-06-01 530-866 0XXX1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H COLFAX CA
2020-06-01 530-977 0XXX1XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → FRACTEL, LLC 965H AUBN NORTH CA
2020-02-04 530-612 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 RANCHOTHMA CA
2019-12-02 530-855 0XXX1XXX5XXX · 3 holders which blocks → FRACTEL, LLC 965H CHICO CA
2019-05-03 530-670 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C CORNING CA
2019-04-01 530-606 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J TRUCKEE CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.