NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

5 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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
2003-11-24 585-545-4XXX 4000–4999Assigned TWC IP ENABLED SERVICES, LLC 793K WEBSTER NY
2003-11-24 585-598-3XXX 3000–3999Assigned TWC IP ENABLED SERVICES, LLC 793K FAIRPORT NY
2003-11-21 585-429-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-11-21 585-613-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-11-21 585-613-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-11-21 585-613-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-11-18 585-339-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-11-17 585-355-4XXX 4000–4999Assigned TWC IP ENABLED SERVICES, LLC 793K ROCHESTER NY
2003-10-23 585-771-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2003-10-23 585-771-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2003-10-06 585-409-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BATAVIA NY
2003-09-30 585-278-9XXX 9000–9999Assigned FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
2003-09-17 585-613-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2003-09-17 585-797-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-09-17 585-797-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-09-15 585-765-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LYNDONVL NY
2003-09-04 585-797-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-08-21 585-797-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-08-21 585-797-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-08-05 585-506-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-07-30 585-267-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 EROCHESTER NY
2003-07-30 585-598-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 FAIRPORT NY
2003-07-21 585-506-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-07-21 585-506-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-07-21 585-506-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-07-21 585-506-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-07-02 585-409-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BATAVIA NY
2003-07-02 585-507-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-07-02 585-507-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-06-26 585-216-4XXX 4000–4999Assigned FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 WEBSTER NY
2003-06-05 585-228-4XXX 4000–4999Assigned TC SYSTEMS, INC. - NY 7140 WARSAW NY
2003-06-02 585-409-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BATAVIA NY
2003-06-02 585-409-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BATAVIA NY
2003-06-02 585-507-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-06-02 585-507-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-05-19 585-365-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BELFAST NY
2003-05-19 585-466-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANGELICA NY
2003-05-19 585-507-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-05-19 585-507-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-05-16 585-267-4XXX 4000–4999Assigned FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 EROCHESTER NY
2003-05-14 585-300-9XXX 9000–9999Assigned METROPCS, INC. 5562 BATAVIA NY
2003-05-07 585-899-0XXX 0000–0999Assigned METROPCS, INC. 5562 EROCHESTER NY
2003-05-07 585-899-9XXX 9000–9999Assigned METROPCS, INC. 5562 EROCHESTER NY
2003-05-06 585-216-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 WEBSTER NY
2003-05-06 585-347-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 W WEBSTER NY
2003-05-06 585-421-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 FAIRPORT NY
2003-05-06 585-486-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 HENRIETTA NY
2003-05-06 585-507-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2003-04-29 585-201-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 BATAVIA NY
2003-04-23 585-322-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BLISS NY

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.