NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 585
FRONTIER TELEPHONE OF ROCHESTER, INC. 186
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 69
ONVOY, LLC- NY 56
NEW CINGULAR WIRELESS PCS, LLC - DC 47
VERIZON NEW YORK, INC. 40
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
2021-01-27 585-823 2XXX3XXX4XXX6XXX · 3 holders which blocks → ONVOY, LLC- NY 384C WARSAW NY
2021-01-27 585-824 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → ONVOY, LLC- NY 384C WAYLAND NY
2021-01-27 585-825 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC- NY 384C WEBSTER NY
2021-01-06 585-788 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC- NY 384C VICTOR NY
2020-12-23 585-910 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC- NY 384C ROCHESTER NY
2020-10-08 585-833 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H EROCHESTER NY
2020-10-08 585-844 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H FAIRPORT NY
2020-09-14 585-553 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 BATAVIA NY
2020-07-24 585-540 0–9 XXXall 10 · 3 holders which blocks → HD CARRIER LLC 321J ROCHESTER NY
2020-07-08 585-677 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H CHAFFEE NY
2020-07-08 585-946 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H AKRON NY
2020-05-29 585-551 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J ROCHESTER NY
2020-05-28 585-517 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC- NY 384C DALTON NY
2020-05-28 585-522 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → ONVOY, LLC- NY 384C BELMONT NY
2020-05-28 585-523 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC- NY 384C WATERPORT NY
2020-05-28 585-620 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → ONVOY, LLC- NY 384C CHURCHVL NY
2020-05-28 585-699 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → ONVOY, LLC- NY 384C DANSVILLE NY
2020-05-12 585-566 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC- NY 384C BLISS NY
2020-05-12 585-580 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC- NY 384C ANGELICA NY
2020-05-12 585-601 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC- NY 384C HENRIETTA NY
2020-03-18 585-515 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E HILTON NY
2020-03-17 585-508 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E HOLCOMB NY
2020-01-27 585-480 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 MIDDLEPORT NY
2020-01-24 585-514 0–9 XXXall 10 · 6 holders which blocks → CSC WIRELESS, LLC 425J ROCHESTER NY
2019-12-19 585-565 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC- NY 384C ROCHESTER NY
2019-10-04 585-710 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H ROCHESTER NY
2019-06-03 585-549 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 GENESEO NY
2019-03-22 585-855 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → TERRA NOVA TELECOM INC. 145J BOLIVAR NY
2019-03-22 585-877 0–9 XXXall 10 · 5 holders which blocks → TERRA NOVA TELECOM INC. 145J ROCHESTER NY
2019-02-14 585-842 1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 LYNDONVL NY
2019-02-14 585-940 0–9 XXXall 10 · 4 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 LEICESTER NY
2019-02-14 585-990 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CORETEL NEW YORK, INC. - NY 1215 NUNDA NY
2018-12-24 585-504 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2018-11-26 585-560 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC- NY 384C MEDINA NY
2018-11-20 585-505 0–9 XXXall 10 · 5 holders which blocks → EMPIRE LONG DISTANCE CORPORATION 087H ROCHESTER NY
2018-11-16 585-575 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC- NY 384C HONEOYE NY
2018-11-16 585-595 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC- NY 384C HEMLOCK NY
2018-10-30 585-501 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E HONEOYEFLS NY
2018-10-30 585-552 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E COHOCTON NY
2018-10-11 585-499 0–9 XXXwhole prefix which blocks → NUSO, LLC 551G ROCHESTER NY
2018-08-31 585-440 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E CHURCHVL NY
2018-08-29 585-470 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2018-08-23 585-460 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E CALEDONIA NY
2018-07-23 585-439 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HENRIETTA NY
2018-06-08 585-450 0–9 XXXall 10 · 6 holders which blocks → VONAGE AMERICA LLC 197D ROCHESTER NY
2018-04-10 585-602 0–9 XXXwhole prefix which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
2018-02-15 585-639 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E BROCKPORT NY
2017-08-07 585-510 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC- NY 384C ROCHESTER NY
2017-04-17 585-408 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELNYX LLC 073H ARCADE NY
2017-03-29 585-867 0–9 XXXall 10 · 5 holders which blocks → COMMIO, LLC 939H ROCHESTER NY

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.