NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

17 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 443
ONVOY, LLC - MD 8
NEW CINGULAR WIRELESS PCS, LLC - DC 4
VERSATEL LLC 1
OPENTACT INC. 1
LEVEL 3 COMMUNICATIONS, 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
2007-10-24 443-359-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 DELMAR MD
2007-10-24 443-517-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2007-10-24 443-975-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PRINCEFRCK MD
2007-10-19 443-683-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2007-10-19 443-792-2XXX 2000–2999Assigned VERIZON MARYLAND, INC. 9212 BRYNPKLNCM MD
2007-10-19 443-792-3XXX 3000–3999Assigned VERIZON MARYLAND, INC. 9212 BRYNPKLNCM MD
2007-10-19 443-955-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2007-10-16 443-453-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D BALTIMORE MD
2007-10-16 443-938-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-10-16 443-938-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-10-16 443-938-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-10-16 443-938-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-10-16 443-938-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-10-15 443-390-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 CHURCHVL MD
2007-10-10 443-615-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-10-10 443-615-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-10-10 443-977-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-10-10 443-977-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-10-10 443-977-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-10-10 443-977-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-10-10 443-986-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-10-10 443-986-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-10-10 443-986-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-10-09 443-497-5XXX 5000–5999Assigned METROPCS, INC. 5562 SALISBURY MD
2007-10-05 443-875-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2007-10-05 443-875-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2007-10-05 443-875-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2007-10-01 443-242-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J SPARROWSPT MD
2007-10-01 443-485-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J ELKTON MD
2007-10-01 443-559-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J ESSEX MD
2007-10-01 443-559-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J ESSEX MD
2007-10-01 443-607-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WEST RIVER MD
2007-10-01 443-736-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J SALISBURY MD
2007-10-01 443-736-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J SALISBURY MD
2007-09-20 443-864-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J COLUMBIA MD
2007-09-20 443-864-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J COLUMBIA MD
2007-09-18 443-813-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2007-09-18 443-962-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2007-09-17 443-292-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J CROFTON MD
2007-09-13 443-471-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PIKESVILLE MD
2007-09-13 443-563-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2007-09-13 443-615-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2007-09-10 443-225-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J CAMBRIDGE MD
2007-09-10 443-274-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J SEVERN MD
2007-09-10 443-371-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J BEL AIR MD
2007-09-10 443-371-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J BEL AIR MD
2007-09-10 443-682-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2007-09-10 443-682-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2007-09-10 443-682-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2007-09-10 443-708-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE 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.