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
2005-08-19 585-598-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 FAIRPORT NY
2005-08-19 585-598-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 FAIRPORT NY
2005-08-19 585-598-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 FAIRPORT NY
2005-08-16 585-478-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-08-16 585-478-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-08-16 585-487-3XXX 3000–3999Assigned FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 HENRIETTA NY
2005-07-26 585-289-7XXX 7000–7999Assigned TWC IP ENABLED SERVICES, LLC 793K SHORTSVL NY
2005-07-26 585-969-4XXX 4000–4999Assigned TWC IP ENABLED SERVICES, LLC 793K PERRY NY
2005-07-25 585-662-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 EROCHESTER NY
2005-07-22 585-487-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J HENRIETTA NY
2005-07-22 585-672-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J ROCHESTER NY
2005-07-22 585-672-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J ROCHESTER NY
2005-07-22 585-672-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J ROCHESTER NY
2005-07-18 585-293-7XXX 7000–7999Assigned TWC IP ENABLED SERVICES, LLC 793K CHURCHVL NY
2005-07-18 585-406-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
2005-07-14 585-502-5XXX 5000–5999Assigned TWC IP ENABLED SERVICES, LLC 793K LE ROY NY
2005-07-08 585-213-4XXX 4000–4999Assigned TWC IP ENABLED SERVICES, LLC 793K WAYLAND NY
2005-07-06 585-406-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-07-06 585-406-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-07-06 585-406-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-07-06 585-406-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-07-06 585-406-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-07-06 585-519-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 GENESEO NY
2005-07-06 585-519-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 GENESEO NY
2005-06-27 585-672-0XXX 0000–0999Assigned TC SYSTEMS, INC. - NY 7140 ROCHESTER NY
2005-06-27 585-672-8XXX 8000–8999Assigned TC SYSTEMS, INC. - NY 7140 ROCHESTER NY
2005-06-22 585-563-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2005-06-22 585-563-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2005-06-13 585-208-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-06-10 585-406-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
2005-06-10 585-662-0XXX 0000–0999Assigned PAETEC ITEL, LLC 829J EROCHESTER NY
2005-06-10 585-662-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J EROCHESTER NY
2005-06-10 585-662-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J EROCHESTER NY
2005-06-07 585-968-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J CUBA NY
2005-06-03 585-469-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-06-03 585-469-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-06-03 585-469-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-06-03 585-813-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BATAVIA NY
2005-05-26 585-204-4XXX 4000–4999Assigned TWC IP ENABLED SERVICES, LLC 793K DANSVILLE NY
2005-05-26 585-204-5XXX 5000–5999Assigned TWC IP ENABLED SERVICES, LLC 793K DANSVILLE NY
2005-05-25 585-294-5XXX 5000–5999Assigned TWC IP ENABLED SERVICES, LLC 793K CALEDONIA NY
2005-05-18 585-753-0XXX 0000–0999Assigned FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
2005-05-18 585-753-1XXX 1000–1999Assigned FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
2005-05-18 585-753-2XXX 2000–2999Assigned FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
2005-05-18 585-753-3XXX 3000–3999Assigned FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
2005-05-18 585-753-4XXX 4000–4999Assigned FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
2005-05-18 585-753-5XXX 5000–5999Assigned FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
2005-05-18 585-753-6XXX 6000–6999Assigned FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
2005-05-18 585-753-7XXX 7000–7999Assigned FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
2005-05-18 585-753-8XXX 8000–8999Assigned FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 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.