NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

5 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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
2018-05-23 240-546-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2018-05-23 240-557-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN6 MD
2018-05-23 240-557-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN6 MD
2018-05-23 240-557-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN6 MD
2018-05-23 240-569-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FLINTSTONE MD
2018-05-23 240-569-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FLINTSTONE MD
2018-05-23 240-569-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FLINTSTONE MD
2018-05-23 240-666-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NANJEMOY MD
2018-05-23 240-666-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NANJEMOY MD
2018-05-23 240-666-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NANJEMOY MD
2018-05-23 240-806-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 INDIANHEAD MD
2018-05-23 240-806-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 INDIANHEAD MD
2018-05-23 240-806-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 INDIANHEAD MD
2018-05-23 240-831-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J FREDERICK MD
2018-05-23 240-846-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2018-05-23 240-867-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN3 MD
2018-05-23 240-867-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN3 MD
2018-05-23 240-996-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BRUNSWICK MD
2018-05-23 240-996-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BRUNSWICK MD
2018-05-23 240-996-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BRUNSWICK MD
2018-05-17 240-594-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BITTINGER MD
2018-05-16 240-690-2XXX 2000–2999Assigned ONVOY, LLC - MD 876D GAITHERSBG MD
2018-05-11 240-521-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2018-05-11 240-521-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2018-05-11 240-521-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2018-05-10 240-219-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D RIDGE MD
2018-05-02 240-512-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D WSNG238Z13 MD
2018-05-01 240-267-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 HAGERSTOWN MD
2018-04-26 240-557-7XXX 7000–7999Assigned BARR TELL USA, INC. 964H WSHNGTNZN6 MD
2018-04-26 240-563-5XXX 5000–5999Assigned BARR TELL USA, INC. 964H WSHNGTNZN5 MD
2018-04-26 240-590-0XXX 0000–0999Assigned BARR TELL USA, INC. 964H WSNGTNZN12 MD
2018-04-26 240-906-5XXX 5000–5999Assigned BARR TELL USA, INC. 964H WSHNGTNZN4 MD
2018-04-19 240-569-1XXX 1000–1999Assigned TELNYX LLC 073H FLINTSTONE MD
2018-04-19 240-655-0XXX 0000–0999Assigned TELNYX LLC 073H KITZMILLER MD
2018-04-18 240-591-1XXX 1000–1999Assigned SHENTEL COMMUNICATIONS, LLC. - MD 836G HAGERSTOWN MD
2018-04-18 240-907-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSNGTNZN10 MD
2018-04-12 240-880-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN11 MD
2018-04-10 240-590-9XXX 9000–9999Assigned METROPCS, INC. 5562 WSNGTNZN12 MD
2018-03-26 240-521-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2018-03-26 240-521-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2018-03-23 240-579-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2018-03-23 240-579-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2018-03-23 240-971-6XXX 6000–6999Assigned METROPCS, INC. 5562 FREDERICK MD
2018-03-07 240-589-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MCCOOLE MD
2018-03-05 240-732-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MOUNT AIRY MD
2018-03-02 240-537-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 HAGERSTOWN MD
2018-03-02 240-584-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL236 MD
2018-02-20 240-985-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 WILLIAMSPT MD
2018-02-16 240-488-2XXX 2000–2999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G OAKLAND MD
2018-02-09 240-436-5XXX 5000–5999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G BUCKEYSTN MD

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.