NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

3 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 631
CSC WIRELESS, LLC 3
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
2005-12-08 631-876-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 SOUTHOLD NY
2005-12-08 631-898-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 WESTHAMPTN NY
2005-12-08 631-910-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 WADING RIV NY
2005-11-30 631-205-7XXX 7000–7999Assigned TC SYSTEMS, INC. - NY 7140 YAPHANK NY
2005-11-30 631-627-3XXX 3000–3999Assigned CSC VOICE, LLC 612K PATCHOGUE NY
2005-11-30 631-627-8XXX 8000–8999Assigned CSC VOICE, LLC 612K PATCHOGUE NY
2005-11-30 631-946-6XXX 6000–6999Assigned CSC VOICE, LLC 612K SELDEN NY
2005-11-28 631-237-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 BRIDGEMPTN NY
2005-11-23 631-935-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HUNTINGTON NY
2005-11-23 631-935-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HUNTINGTON NY
2005-11-23 631-935-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HUNTINGTON NY
2005-11-22 631-946-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J SELDEN NY
2005-11-16 631-259-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 SOUTHAMPTN NY
2005-11-16 631-443-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 EASTPORT NY
2005-11-16 631-593-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 GREENPORT NY
2005-11-16 631-749-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 SHELTER IS NY
2005-11-16 631-816-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 YAPHANK NY
2005-11-16 631-887-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 HAMPTNBAYS NY
2005-11-16 631-938-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 PTJEFFERSN NY
2005-11-08 631-297-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS, INC. - NY 6622 CENTRAISLP NY
2005-11-08 631-760-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 HUNTINGTON NY
2005-11-07 631-209-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 SHOREHAM NY
2005-11-04 631-498-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 COLDSPGHBR NY
2005-11-04 631-621-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 ST JAMES NY
2005-11-04 631-886-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 WADING RIV NY
2005-11-03 631-627-6XXX 6000–6999Assigned CSC VOICE, LLC 612K PATCHOGUE NY
2005-11-03 631-627-7XXX 7000–7999Assigned CABLEVISION LIGHTPATH, INC. - NY 7126 PATCHOGUE NY
2005-10-27 631-284-7XXX 7000–7999Assigned METROPCS, INC. 5562 RIVERHEAD NY
2005-10-21 631-357-6XXX 6000–6999Assigned METROPCS, INC. 5562 BRENTWOOD NY
2005-10-20 631-343-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 COMMACK NY
2005-10-20 631-378-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 SHOREHAM NY
2005-10-20 631-406-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 SMITHTOWN NY
2005-10-20 631-406-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 SMITHTOWN NY
2005-10-20 631-693-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 AMITYVILLE NY
2005-10-20 631-693-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 AMITYVILLE NY
2005-10-20 631-830-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 RIVERHEAD NY
2005-10-20 631-869-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 BELLPORT NY
2005-10-20 631-956-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 LINDENHST NY
2005-10-17 631-204-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 SOUTHAMPTN NY
2005-10-17 631-251-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 SAG HARBOR NY
2005-10-17 631-284-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 RIVERHEAD NY
2005-10-17 631-325-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 EASTPORT NY
2005-10-17 631-771-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 E HAMPTON NY
2005-10-11 631-901-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
2005-10-11 631-901-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
2005-10-11 631-901-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
2005-10-11 631-901-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
2005-10-11 631-901-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
2005-10-11 631-901-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
2005-10-11 631-901-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD 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.