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 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
2022-01-28 585-616 0XXX1XXX2XXX3XXX6XXX7XXX9XXX · 6 holders which blocks → AT&T - LOCAL 7421 ALBION NY
2022-01-24 585-608 0XXX2XXX7XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E ANGELICA NY
2022-01-24 585-609 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WELLSVILLE NY
2022-01-13 585-887 0XXX2XXX3XXX6XXX7XXX · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J LIVONIA NY
2021-12-14 585-604 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 BATAVIA NY
2021-12-14 585-606 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 EROCHESTER NY
2021-12-07 585-603 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J ROCHESTER NY
2021-12-03 585-614 3XXX4XXX6XXX · 3 holders which blocks → ONVOY, LLC- NY 384C SHORTSVL NY
2021-11-22 585-895 0–9 XXXall 10 · 5 holders which blocks → TWILIO INTERNATIONAL, INC. 506J ROCHESTER NY
2021-10-13 585-579 0XXX1XXX8XXX9XXX · 3 holders which blocks → PEERING HUB, INC. - NY 818H BERGEN NY
2021-10-13 585-592 0XXX2XXX5XXX6XXX · 3 holders which blocks → PEERING HUB, INC. - NY 818H BELMONT NY
2021-09-24 585-578 0XXX1XXX6XXX · 3 holders which blocks → COMMIO, LLC 939H CASTILE NY
2021-09-23 585-799 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H BYRON NY
2021-09-08 585-557 0–9 XXXall 10 · 4 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J ROCHESTER NY
2021-08-11 585-574 0–9 XXXall 10 · 2 holders which blocks → FINGER LAKES TECHNOLOGIES GROUP, INC. - NY 629E ROCHESTER NY
2021-07-09 585-569 0XXX1XXX2XXX3XXX5XXX · 3 holders which blocks → STRATUS NETWORKS 495J WARSAW NY
2021-07-07 585-556 0XXX2XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → ONVOY, LLC- NY 384C DARIEN NY
2021-05-25 585-564 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC- NY 384C SPENCERPT NY
2021-05-14 585-562 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E ATTICA NY
2021-05-14 585-650 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H RUSHFORD NY
2021-05-14 585-665 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY SPECTRUM, LLC 624H OAKFIELD NY
2021-05-14 585-772 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H WELLSVILLE NY
2021-05-14 585-868 0XXX3XXX6XXX8XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H VARYSBURG NY
2021-04-21 585-837 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BATAVIA NY
2021-04-19 585-561 0XXX1XXX9XXX · 3 holders which blocks → TELNYX LLC 073H NAPLES NY
2021-04-13 585-570 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H FRIENDSHIP NY
2021-04-13 585-686 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H HOLLEY NY
2021-04-13 585-744 6XXX7XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H JAVA NY
2021-04-13 585-767 2XXX6XXX7XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H FRANKLINVL NY
2021-04-13 585-835 5XXX6XXX8XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H KENDALL NY
2021-04-07 585-853 0XXX6XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ATLANTA NY
2021-04-02 585-605 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H FILLMORE NY
2021-04-02 585-745 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H ALBION NY
2021-04-02 585-858 0XXX1XXX2XXX3XXX5XXX6XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H BELFAST NY
2021-04-02 585-875 0XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H CUBA NY
2021-04-02 585-885 2XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H ELBA NY
2021-03-30 585-559 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J ROCHESTER NY
2021-03-02 585-688 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H BROCKPORT NY
2021-02-02 585-573 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC- NY 384C RUSH NY
2021-02-02 585-583 0XXX1XXX2XXX3XXX8XXX · 3 holders which blocks → ONVOY, LLC- NY 384C SPRINGWTR NY
2021-01-27 585-803 1XXX2XXX3XXX4XXX5XXX · 3 holders which blocks → ONVOY, LLC- NY 384C ATLANTA NY
2021-01-27 585-804 0XXX1XXX2XXX4XXX5XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC- NY 384C AVON NY
2021-01-27 585-809 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC- NY 384C CANANDAGUA NY
2021-01-27 585-812 0XXX1XXX2XXX3XXX4XXX7XXX8XXX · 6 holders which blocks → ONVOY, LLC- NY 384C LE ROY NY
2021-01-27 585-816 0XXX2XXX3XXX5XXX8XXX · 3 holders which blocks → ONVOY, LLC- NY 384C NAPLES NY
2021-01-27 585-817 0XXX1XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ONVOY, LLC- NY 384C PAVILION NY
2021-01-27 585-818 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → ONVOY, LLC- NY 384C PERRY NY
2021-01-27 585-819 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC- NY 384C SCOTTSVL NY
2021-01-27 585-821 0XXX1XXX2XXX3XXX5XXX7XXX8XXX · 6 holders which blocks → ONVOY, LLC- NY 384C STANLEY NY
2021-01-27 585-822 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → ONVOY, LLC- NY 384C W WEBSTER NY

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.