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
2011-06-07 585-250-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E BATAVIA NY
2011-06-07 585-358-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E HENRIETTA NY
2011-06-07 585-391-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E BROCKPORT NY
2011-06-07 585-714-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E EASTAURORA NY
2011-06-03 585-353-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2011-05-27 585-888-8XXX 8000–8999Assigned FINGER LAKES TECHNOLOGIES GROUP, INC. - NY 629E SCOTTSVL NY
2011-05-25 585-657-2XXX 2000–2999Assigned FINGER LAKES TECHNOLOGIES GROUP, INC. - NY 629E HOLCOMB NY
2011-05-23 585-353-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2011-05-23 585-626-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 WEBSTER NY
2011-05-20 585-310-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. - NY 282E EROCHESTER NY
2011-05-20 585-310-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - NY 282E EROCHESTER NY
2011-05-20 585-337-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - NY 282E CANANDAGUA NY
2011-05-20 585-364-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - NY 282E FAIRPORT NY
2011-05-20 585-444-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - NY 282E HENRIETTA NY
2011-05-20 585-626-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - NY 282E WEBSTER NY
2011-05-12 585-633-0XXX 0000–0999Assigned YMAX COMMUNICATIONS CORP. - NY 282E ROCHESTER NY
2011-05-12 585-633-1XXX 1000–1999Assigned YMAX COMMUNICATIONS CORP. - NY 282E ROCHESTER NY
2011-05-12 585-633-2XXX 2000–2999Assigned YMAX COMMUNICATIONS CORP. - NY 282E ROCHESTER NY
2011-05-12 585-633-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. - NY 282E ROCHESTER NY
2011-05-12 585-633-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. - NY 282E ROCHESTER NY
2011-05-12 585-633-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - NY 282E ROCHESTER NY
2011-05-12 585-633-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - NY 282E ROCHESTER NY
2011-05-10 585-361-0XXX 0000–0999Assigned WINDSTREAM NEW YORK, INC. - RED JACKET 0113 SHORTSVL NY
2011-05-10 585-466-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E ANGELICA NY
2011-05-10 585-666-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E ROCHESTER NY
2011-05-10 585-666-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E ROCHESTER NY
2011-05-10 585-666-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E ROCHESTER NY
2011-05-04 585-236-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 WEBSTER NY
2011-05-04 585-250-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BATAVIA NY
2011-05-04 585-353-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2011-05-04 585-364-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E FAIRPORT NY
2011-05-04 585-431-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF NEW YORK, LP - NY 8473 BROCKPORT NY
2011-05-04 585-735-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 MIDDLEPORT NY
2011-04-28 585-236-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E WEBSTER NY
2011-04-28 585-337-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E CANANDAGUA NY
2011-04-28 585-666-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E ROCHESTER NY
2011-04-28 585-666-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E ROCHESTER NY
2011-04-28 585-666-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E ROCHESTER NY
2011-04-28 585-678-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E FAIRPORT NY
2011-04-08 585-353-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2011-04-04 585-228-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E WARSAW NY
2011-04-04 585-236-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 WEBSTER NY
2011-03-30 585-719-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
2011-03-24 585-666-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J ROCHESTER NY
2011-03-17 585-332-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E LYNDONVL NY
2011-03-17 585-457-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E JAVA NY
2011-03-02 585-784-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2011-02-28 585-626-3XXX 3000–3999Assigned FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 WEBSTER NY
2011-02-25 585-310-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E EROCHESTER NY
2011-02-23 585-332-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - NY 997E LYNDONVL 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.