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
2008-07-03 443-510-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2008-07-03 443-510-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2008-07-03 443-510-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2008-07-03 443-510-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2008-07-03 443-545-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2008-07-03 443-945-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ELKTON MD
2008-07-03 443-975-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PRINCEFRCK MD
2008-07-03 443-987-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BEL AIR MD
2008-06-27 443-636-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E CATONSVL MD
2008-06-27 443-636-9XXX 9000–9999Assigned YMAX COMMUNICATIONS CORP. - MD 281E CATONSVL MD
2008-06-27 443-951-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - MD 281E ANNAPOLIS MD
2008-06-27 443-951-8XXX 8000–8999Assigned YMAX COMMUNICATIONS CORP. - MD 281E ANNAPOLIS MD
2008-06-26 443-364-4XXX 4000–4999Assigned YMAX COMMUNICATIONS CORP. - MD 281E ELLICOTTCY MD
2008-06-20 443-743-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2008-06-17 443-579-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ESSEX MD
2008-06-17 443-636-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CATONSVL MD
2008-06-11 443-968-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PRINCEFRCK MD
2008-06-06 443-679-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SEVERN MD
2008-06-04 443-559-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J ESSEX MD
2008-06-04 443-559-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J ESSEX MD
2008-06-03 443-987-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BEL AIR MD
2008-06-02 443-731-1XXX 1000–1999Assigned ARMSTRONG TELECOMMUNICATIONS, INC. - MD 420C PT DEPOSIT MD
2008-05-29 443-718-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J COLUMBIA MD
2008-05-29 443-718-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J COLUMBIA MD
2008-05-29 443-761-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 TOWSON MD
2008-05-29 443-872-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2008-05-28 443-453-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2008-05-28 443-602-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2008-05-28 443-627-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2008-05-27 443-212-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 SPARKSGLNC MD
2008-05-27 443-840-1XXX 1000–1999Assigned VERIZON MARYLAND, INC. 9212 CATONSVL MD
2008-05-27 443-840-2XXX 2000–2999Assigned VERIZON MARYLAND, INC. 9212 CATONSVL MD
2008-05-27 443-840-3XXX 3000–3999Assigned VERIZON MARYLAND, INC. 9212 CATONSVL MD
2008-05-27 443-840-4XXX 4000–4999Assigned VERIZON MARYLAND, INC. 9212 CATONSVL MD
2008-05-27 443-840-5XXX 5000–5999Assigned VERIZON MARYLAND, INC. 9212 CATONSVL MD
2008-05-21 443-203-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WEST RIVER MD
2008-05-21 443-372-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J EDGEWOOD MD
2008-05-19 443-319-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 COLUMBIA MD
2008-05-19 443-353-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J COCKEYSVL MD
2008-05-19 443-430-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 COLUMBIA MD
2008-05-19 443-449-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2008-05-19 443-453-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2008-05-19 443-453-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2008-05-19 443-453-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2008-05-19 443-453-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2008-05-19 443-453-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2008-05-19 443-453-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2008-05-19 443-453-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2008-05-19 443-455-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2008-05-19 443-559-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ESSEX 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.