NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

17 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 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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2007-07-25 443-895-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2007-07-24 443-636-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - MD 281E CATONSVL MD
2007-07-24 443-951-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E ANNAPOLIS MD
2007-07-19 443-449-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-07-19 443-449-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-07-19 443-572-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2007-07-18 443-895-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J TOWSON MD
2007-07-17 443-364-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ELLICOTTCY MD
2007-07-17 443-449-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2007-07-17 443-449-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2007-07-17 443-449-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2007-07-17 443-798-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2007-07-17 443-856-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 OCEAN CITY MD
2007-07-03 443-477-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 CAMBRIDGE MD
2007-07-03 443-602-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2007-07-03 443-602-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2007-07-03 443-859-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2007-07-03 443-896-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2007-07-03 443-907-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ELKTON MD
2007-07-03 443-975-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PRINCEFRCK MD
2007-07-02 443-712-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 REISTERSTN MD
2007-06-26 443-876-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BEL AIR MD
2007-06-26 443-876-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BEL AIR MD
2007-06-26 443-876-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BEL AIR MD
2007-06-25 443-449-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-06-25 443-449-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-06-19 443-502-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J HAVREGRACE MD
2007-06-15 443-942-0XXX 0000–0999Assigned METROPCS, INC. 5562 SEVERNA PK MD
2007-06-15 443-942-1XXX 1000–1999Assigned METROPCS, INC. 5562 SEVERNA PK MD
2007-06-15 443-942-2XXX 2000–2999Assigned METROPCS, INC. 5562 SEVERNA PK MD
2007-06-15 443-942-3XXX 3000–3999Assigned METROPCS, INC. 5562 SEVERNA PK MD
2007-06-12 443-501-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PIKESVILLE MD
2007-06-11 443-563-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-06-04 443-376-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J DUNDALK MD
2007-06-04 443-458-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2007-06-04 443-602-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2007-06-04 443-602-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2007-06-04 443-602-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2007-06-01 443-982-0XXX 0000–0999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-1XXX 1000–1999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-2XXX 2000–2999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-3XXX 3000–3999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-7XXX 7000–7999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-06-01 443-982-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E BALTIMORE MD
2007-05-25 443-367-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J COLUMBIA MD
2007-05-24 443-881-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J REISTERSTN 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.