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
2008-09-03 301-525-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GAITHERSBG MD
2008-09-03 301-832-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN4 MD
2008-09-02 301-327-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSNG238Z15 MD
2008-09-02 301-327-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSNG238Z15 MD
2008-08-20 301-281-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN6 MD
2008-08-20 301-281-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN6 MD
2008-08-20 301-377-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 LAUREL236 MD
2008-08-20 301-825-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN10 MD
2008-08-20 301-825-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN10 MD
2008-08-20 301-825-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN10 MD
2008-08-20 301-825-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN10 MD
2008-08-08 301-898-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J FREDERICK MD
2008-08-04 301-525-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GAITHERSBG MD
2008-08-04 301-832-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN4 MD
2008-07-21 301-979-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN10 MD
2008-07-21 301-979-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN10 MD
2008-07-03 301-278-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WSHNGTNZN5 MD
2008-07-03 301-278-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WSHNGTNZN5 MD
2008-06-20 301-755-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WSHNGTNZN3 MD
2008-06-20 301-755-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WSHNGTNZN3 MD
2008-06-17 301-833-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSNG236Z14 MD
2008-06-17 301-833-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSNG236Z14 MD
2008-06-17 301-833-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSNG236Z14 MD
2008-06-17 301-833-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSNG236Z14 MD
2008-06-16 301-281-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN6 MD
2008-06-16 301-283-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN6 MD
2008-06-16 301-364-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN4 MD
2008-06-16 301-364-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN4 MD
2008-06-03 301-525-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GAITHERSBG MD
2008-06-03 301-832-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN4 MD
2008-05-21 301-355-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D GAITHERSBG MD
2008-05-21 301-364-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D WSHNGTNZN4 MD
2008-05-21 301-373-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D LEONARDTN MD
2008-05-21 301-679-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D WSNGTNZN12 MD
2008-05-21 301-778-2XXX 2000–2999Assigned ONVOY, LLC - MD 876D WSHNGTNZN5 MD
2008-05-21 301-944-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GAITHERSBG MD
2008-05-21 301-965-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D WSHNGTNZN6 MD
2008-05-19 301-433-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN5 MD
2008-05-19 301-433-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN5 MD
2008-05-19 301-605-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN10 MD
2008-05-19 301-605-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN10 MD
2008-05-19 301-747-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN6 MD
2008-05-06 301-234-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNGTNZN16 MD
2008-05-06 301-525-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GAITHERSBG MD
2008-05-06 301-832-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN4 MD
2008-05-02 301-582-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAGERSTOWN MD
2008-04-14 301-485-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J WSHNGTNZN6 MD
2008-04-02 301-875-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL236 MD
2008-04-02 301-875-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL236 MD
2008-04-02 301-957-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL236 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.