NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 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 301
ONVOY, LLC - MD 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
2011-11-16 301-708-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2011-11-15 301-690-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEONARDTN MD
2011-11-09 301-454-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN4 MD
2011-11-04 301-732-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J FREDERICK MD
2011-10-28 301-708-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2011-10-27 301-363-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F DAMASCS240 MD
2011-10-20 301-549-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J ASHTON236 MD
2011-10-19 301-708-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2011-10-19 301-708-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2011-10-14 301-970-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNG238Z14 MD
2011-10-13 301-880-6XXX 6000–6999Assigned METROPCS, INC. 5562 LXTNPKGRML MD
2011-10-05 301-267-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2011-10-05 301-267-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2011-10-05 301-267-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2011-10-05 301-267-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2011-10-05 301-267-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2011-10-05 301-267-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2011-10-05 301-267-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2011-10-05 301-267-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2011-10-05 301-267-8XXX 8000–8999Assigned METROPCS, INC. 5562 WSHNGTNZN3 MD
2011-10-05 301-363-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 DAMASCS240 MD
2011-10-05 301-844-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2011-10-03 301-407-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J GAITHERSBG MD
2011-09-16 301-557-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-09-16 301-557-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-09-16 301-557-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-09-16 301-557-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-09-16 301-557-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-09-16 301-557-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-09-16 301-557-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-09-16 301-557-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-09-15 301-364-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN4 MD
2011-09-02 301-310-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2011-09-02 301-310-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2011-09-01 301-453-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F KITZMILLER MD
2011-08-26 301-569-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J GAITHERSBG MD
2011-08-23 301-569-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E GAITHERSBG MD
2011-08-23 301-740-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - MD 281E GAITHERSBG MD
2011-08-17 301-250-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GAITHERSBG MD
2011-08-17 301-250-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GAITHERSBG MD
2011-08-17 301-250-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GAITHERSBG MD
2011-08-17 301-250-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GAITHERSBG MD
2011-08-17 301-289-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNG236Z13 MD
2011-08-15 301-338-4XXX 4000–4999Assigned METROPCS, INC. 5562 CUMBERLAND MD
2011-08-15 301-338-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CUMBERLAND MD
2011-08-15 301-338-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CUMBERLAND MD
2011-08-09 301-326-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2011-08-09 301-408-6XXX 6000–6999Assigned METROPCS, INC. 5562 WSHNGTNZN3 MD
2011-08-09 301-628-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2011-08-09 301-905-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD

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.