NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

5 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, last 30 days — NPA 585
EXIANT COMMUNICATIONS LLC 3
TC SYSTEMS, INC. - NY 1
NEW CINGULAR WIRELESS PCS, LLC - DC 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 thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2019-08-12 585-541-3XXX 3000–3999Assigned ONVOY, LLC- NY 384C CASTILE NY
2019-08-12 585-549-2XXX 2000–2999Assigned ONVOY, LLC- NY 384C GENESEO NY
2019-08-12 585-549-3XXX 3000–3999Assigned ONVOY, LLC- NY 384C GENESEO NY
2019-08-12 585-552-2XXX 2000–2999Assigned ONVOY, LLC- NY 384C COHOCTON NY
2019-08-12 585-552-3XXX 3000–3999Assigned ONVOY, LLC- NY 384C COHOCTON NY
2019-08-12 585-572-7XXX 7000–7999Assigned ONVOY, LLC- NY 384C LIVONIA NY
2019-08-12 585-572-8XXX 8000–8999Assigned ONVOY, LLC- NY 384C LIVONIA NY
2019-08-12 585-575-2XXX 2000–2999Assigned ONVOY, LLC- NY 384C HONEOYE NY
2019-08-12 585-577-4XXX 4000–4999Assigned ONVOY, LLC- NY 384C CANANDAGUA NY
2019-08-12 585-577-5XXX 5000–5999Assigned ONVOY, LLC- NY 384C CANANDAGUA NY
2019-08-12 585-584-6XXX 6000–6999Assigned ONVOY, LLC- NY 384C PAVILION NY
2019-08-12 585-595-2XXX 2000–2999Assigned ONVOY, LLC- NY 384C HEMLOCK NY
2019-08-12 585-636-2XXX 2000–2999Assigned ONVOY, LLC- NY 384C HAMLIN NY
2019-08-12 585-636-3XXX 3000–3999Assigned ONVOY, LLC- NY 384C HAMLIN NY
2019-08-12 585-639-3XXX 3000–3999Assigned ONVOY, LLC- NY 384C BROCKPORT NY
2019-08-12 585-639-4XXX 4000–4999Assigned ONVOY, LLC- NY 384C BROCKPORT NY
2019-08-12 585-883-3XXX 3000–3999Assigned ONVOY, LLC- NY 384C MT MORRIS NY
2019-08-12 585-888-5XXX 5000–5999Assigned ONVOY, LLC- NY 384C SCOTTSVL NY
2019-08-12 585-940-2XXX 2000–2999Assigned ONVOY, LLC- NY 384C LEICESTER NY
2019-08-12 585-940-3XXX 3000–3999Assigned ONVOY, LLC- NY 384C LEICESTER NY
2019-08-12 585-969-9XXX 9000–9999Assigned ONVOY, LLC- NY 384C PERRY NY
2019-08-12 585-990-2XXX 2000–2999Assigned ONVOY, LLC- NY 384C NUNDA NY
2019-08-12 585-990-3XXX 3000–3999Assigned ONVOY, LLC- NY 384C NUNDA NY
2019-08-07 585-543-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 OLEAN NY
2019-08-07 585-866-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 MIDDLEPORT NY
2019-07-22 585-877-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2019-07-12 585-450-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2019-07-12 585-470-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2019-06-20 585-439-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HENRIETTA NY
2019-06-13 585-450-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E ROCHESTER NY
2019-06-13 585-450-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E ROCHESTER NY
2019-05-30 585-648-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 WELLSVILLE NY
2019-05-28 585-437-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 RUSHFORD NY
2019-05-28 585-597-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 CORFU NY
2019-05-28 585-789-2XXX 2000–2999Assigned PEERLESS NETWORK OF NEW YORK, LLC - NY 155E EROCHESTER NY
2019-05-28 585-990-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NUNDA NY
2019-05-20 585-536-2XXX 2000–2999Assigned CORETEL NEW YORK, INC. - NY 1215 BATAVIA NY
2019-05-20 585-547-8XXX 8000–8999Assigned CORETEL NEW YORK, INC. - NY 1215 DARIEN NY
2019-05-20 585-664-2XXX 2000–2999Assigned CORETEL NEW YORK, INC. - NY 1215 BATAVIA NY
2019-05-20 585-664-7XXX 7000–7999Assigned CORETEL NEW YORK, INC. - NY 1215 BATAVIA NY
2019-05-20 585-842-4XXX 4000–4999Assigned CORETEL NEW YORK, INC. - NY 1215 LYNDONVL NY
2019-05-20 585-842-6XXX 6000–6999Assigned CORETEL NEW YORK, INC. - NY 1215 LYNDONVL NY
2019-05-20 585-842-7XXX 7000–7999Assigned CORETEL NEW YORK, INC. - NY 1215 LYNDONVL NY
2019-05-15 585-617-7XXX 7000–7999Assigned TC SYSTEMS, INC. - NY 7140 SPENCERPT NY
2019-05-15 585-639-6XXX 6000–6999Assigned TC SYSTEMS, INC. - NY 7140 BROCKPORT NY
2019-05-14 585-504-3XXX 3000–3999Assigned ONVOY, LLC- NY 384C ROCHESTER NY
2019-05-14 585-504-4XXX 4000–4999Assigned ONVOY, LLC- NY 384C ROCHESTER NY
2019-05-14 585-504-6XXX 6000–6999Assigned ONVOY, LLC- NY 384C ROCHESTER NY
2019-05-14 585-504-7XXX 7000–7999Assigned ONVOY, LLC- NY 384C ROCHESTER NY
2019-05-01 585-504-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E ROCHESTER NY

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.