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
2012-08-06 301-337-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GAITHERSBG MD
2012-08-06 301-456-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN5 MD
2012-08-02 301-348-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2012-08-02 301-666-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2012-08-01 301-378-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 FREDERICK MD
2012-07-27 301-264-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F MT SAVAGE MD
2012-07-27 301-478-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FLINTSTONE MD
2012-07-16 301-291-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNG236Z14 MD
2012-07-16 301-679-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNGTNZN12 MD
2012-06-18 301-778-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN5 MD
2012-06-08 301-364-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D WSHNGTNZN4 MD
2012-06-05 301-276-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN4 MD
2012-05-29 301-453-1XXX 1000–1999Assigned SHENTEL COMMUNICATIONS, LLC. - MD 836G KITZMILLER MD
2012-05-29 301-494-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNG238Z15 MD
2012-05-18 301-456-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN5 MD
2012-05-18 301-456-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN5 MD
2012-05-18 301-887-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN4 MD
2012-05-18 301-955-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN4 MD
2012-05-15 301-337-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GAITHERSBG MD
2012-05-15 301-337-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GAITHERSBG MD
2012-05-14 301-960-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN3 MD
2012-05-04 301-200-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F INDIANHEAD MD
2012-05-02 301-842-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CLEAR SPG MD
2012-04-27 301-703-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J MOUNT AIRY MD
2012-03-30 301-679-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNGTNZN12 MD
2012-03-28 301-200-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 INDIANHEAD MD
2012-03-28 301-850-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNG236Z14 MD
2012-03-23 301-276-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN4 MD
2012-03-23 301-892-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN4 MD
2012-03-09 301-888-8XXX 8000–8999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WSNGTNZN16 MD
2012-03-07 301-569-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D GAITHERSBG MD
2012-03-07 301-778-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D WSHNGTNZN5 MD
2012-02-24 301-531-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN4 MD
2012-02-23 301-463-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 LONACONING MD
2012-02-06 301-250-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D GAITHERSBG MD
2012-02-06 301-339-6XXX 6000–6999Assigned LEVEL 3 TELECOM OF MARYLAND, LLC - MD 7591 WSNGTNZN10 MD
2012-01-24 301-820-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GAITHERSBG MD
2012-01-24 301-820-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GAITHERSBG MD
2012-01-24 301-820-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GAITHERSBG MD
2012-01-20 301-338-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CUMBERLAND MD
2012-01-11 301-359-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WESTERNPT MD
2012-01-09 301-895-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F GRANTSVL MD
2012-01-06 301-750-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FRIENDSVL MD
2011-12-27 301-241-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F HIGHFIELD MD
2011-12-27 301-245-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BITTINGER MD
2011-12-21 301-605-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNGTNZN10 MD
2011-12-15 301-569-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J GAITHERSBG MD
2011-12-13 301-463-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F LONACONING MD
2011-11-16 301-456-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN5 MD
2011-11-16 301-708-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 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.