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
2007-11-08 301-447-8XXX 8000–8999Assigned VERIZON MARYLAND, INC. 9212 EMMITSBURG MD
2007-11-06 301-256-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 LAUREL236 MD
2007-10-26 301-328-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2007-10-26 301-789-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN4 MD
2007-10-26 301-789-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN4 MD
2007-10-25 301-276-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J WSHNGTNZN4 MD
2007-10-24 301-542-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WALDORF MD
2007-10-24 301-997-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LEONARDTN MD
2007-10-16 301-710-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WALDORF MD
2007-10-16 301-755-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2007-10-15 301-501-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 OAKLAND MD
2007-10-05 301-710-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WALDORF MD
2007-09-27 301-328-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WSHNGTNZN3 MD
2007-09-27 301-328-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WSHNGTNZN3 MD
2007-09-24 301-259-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F TOMPKINSVL MD
2007-09-24 301-375-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F INDIANHEAD MD
2007-09-24 301-778-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN5 MD
2007-09-24 301-997-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F LEONARDTN MD
2007-09-19 301-841-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN2 MD
2007-09-13 301-755-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2007-09-13 301-917-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN10 MD
2007-09-13 301-978-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN10 MD
2007-09-10 301-684-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J INDIANHEAD MD
2007-09-05 301-957-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL236 MD
2007-09-05 301-957-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL236 MD
2007-08-27 301-968-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN2 MD
2007-08-22 301-357-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2007-08-22 301-357-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2007-08-22 301-357-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2007-08-22 301-357-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2007-08-22 301-357-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2007-08-22 301-357-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2007-08-22 301-357-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2007-08-22 301-357-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2007-08-22 301-408-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
2007-08-21 301-750-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J FRIENDSVL MD
2007-08-17 301-357-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D WSHNGTNZN3 MD
2007-08-17 301-444-5XXX 5000–5999Assigned IP HORIZON LLC 515J WSNGTNZN10 MD
2007-08-02 301-861-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WALDORF MD
2007-08-02 301-957-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL236 MD
2007-08-02 301-957-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL236 MD
2007-08-01 301-830-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2007-07-31 301-355-5XXX 5000–5999Assigned VERIZON MARYLAND, INC. 9212 GAITHERSBG MD
2007-07-31 301-355-6XXX 6000–6999Assigned VERIZON MARYLAND, INC. 9212 GAITHERSBG MD
2007-07-31 301-355-7XXX 7000–7999Assigned VERIZON MARYLAND, INC. 9212 GAITHERSBG MD
2007-07-26 301-302-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAGERSTOWN MD
2007-07-26 301-302-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAGERSTOWN MD
2007-07-24 301-327-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSNG238Z15 MD
2007-07-24 301-368-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J DAMASCS236 MD
2007-07-23 301-956-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GAITHERSBG 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.