NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

5 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 240
BANDWIDTH.COM CLEC, LLC - MD 3
OPENTACT INC. 1
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
2010-06-03 240-454-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GAITHERSBG MD
2010-06-03 240-457-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FREDERICK MD
2010-05-28 240-283-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNGTNZN11 MD
2010-05-28 240-283-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNGTNZN11 MD
2010-05-28 240-284-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FROSTBURG MD
2010-05-28 240-297-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNG236Z13 MD
2010-05-28 240-339-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNG236Z15 MD
2010-05-28 240-397-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FREDERICK MD
2010-05-28 240-406-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNGTNZN10 MD
2010-05-28 240-435-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WALDORF MD
2010-05-28 240-442-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F OAKLAND MD
2010-05-28 240-473-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNG236Z13 MD
2010-05-28 240-473-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNG236Z13 MD
2010-05-28 240-490-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F MIDDLETOWN MD
2010-05-28 240-507-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN2 MD
2010-05-28 240-554-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F LAUREL236 MD
2010-05-28 240-839-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2010-05-27 240-468-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN3 MD
2010-05-27 240-468-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN3 MD
2010-05-27 240-813-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F GAITHERSBG MD
2010-05-27 240-813-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F GAITHERSBG MD
2010-05-27 240-813-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F GAITHERSBG MD
2010-05-13 240-920-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CUMBERLAND MD
2010-05-13 240-920-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CUMBERLAND MD
2010-05-10 240-640-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WALDORF MD
2010-05-07 240-938-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2010-05-05 240-479-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN2 MD
2010-04-30 240-392-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN5 MD
2010-04-29 240-554-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2010-04-28 240-583-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LAUREL236 MD
2010-04-28 240-583-3XXX 3000–3999Assigned VERIZON MARYLAND, INC. 9212 LAUREL236 MD
2010-04-28 240-583-4XXX 4000–4999Assigned VERIZON MARYLAND, INC. 9212 LAUREL236 MD
2010-04-28 240-583-5XXX 5000–5999Assigned VERIZON MARYLAND, INC. 9212 LAUREL236 MD
2010-04-28 240-583-6XXX 6000–6999Assigned VERIZON MARYLAND, INC. 9212 LAUREL236 MD
2010-04-15 240-439-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 FREDERICK MD
2010-04-15 240-640-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WALDORF MD
2010-04-05 240-397-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FREDERICK MD
2010-04-05 240-424-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN3 MD
2010-04-01 240-241-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNG236Z13 MD
2010-03-30 240-210-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WALDORF MD
2010-03-30 240-582-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN4 MD
2010-03-22 240-319-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F LAUREL238 MD
2010-03-19 240-206-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNG236Z14 MD
2010-03-09 240-382-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAGERSTOWN MD
2010-03-04 240-285-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FREDERICK MD
2010-03-04 240-382-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HAGERSTOWN MD
2010-03-04 240-382-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HAGERSTOWN MD
2010-03-04 240-382-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HAGERSTOWN MD
2010-03-04 240-382-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HAGERSTOWN MD
2010-02-23 240-284-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J FROSTBURG 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.