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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2005-03-02 443-867-9XXX 9000–9999Assigned METROPCS, INC. 5562 GLENBURNIE MD
2005-02-23 443-295-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PRINCEFRCK MD
2005-02-23 443-694-0XXX 0000–0999Assigned METROPCS, INC. 5562 SEVERNA PK MD
2005-02-22 443-341-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-02-22 443-498-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-02-22 443-498-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-02-22 443-514-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-02-22 443-670-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-02-22 443-670-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-02-22 443-670-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-02-22 443-670-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-02-22 443-710-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-02-22 443-710-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-02-22 443-710-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-02-22 443-710-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-02-22 443-710-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-02-22 443-710-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-02-22 443-710-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-02-15 443-542-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 COLUMBIA MD
2005-02-15 443-807-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 FALLSTON MD
2005-02-15 443-867-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2005-02-15 443-957-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2005-02-11 443-200-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J WOODLAWN MD
2005-02-11 443-203-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WEST RIVER MD
2005-02-11 443-212-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J SPARKSGLNC MD
2005-02-11 443-216-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J DUNDALK MD
2005-02-11 443-231-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J ESSEX MD
2005-02-11 443-242-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J SPARROWSPT MD
2005-02-11 443-266-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J GLENWOOD MD
2005-02-11 443-295-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PRINCEFRCK MD
2005-02-11 443-296-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WATERLO238 MD
2005-02-11 443-299-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J FALLSTON MD
2005-02-11 443-404-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J SOLOMONS MD
2005-02-11 443-445-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J ELKRIDGE MD
2005-02-11 443-491-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PARKTON MD
2005-02-11 443-502-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J HAVREGRACE MD
2005-02-11 443-517-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J GLENBURNIE MD
2005-02-11 443-550-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J NORTHBEACH MD
2005-02-10 443-292-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J CROFTON MD
2005-02-10 443-304-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J ARBUTUS MD
2005-02-10 443-305-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J ARGRGBSNIS MD
2005-02-10 443-312-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J BRYNPKLNCM MD
2005-02-10 443-318-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J COCKEYSVL MD
2005-02-10 443-319-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J COLUMBIA MD
2005-02-10 443-330-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J COCKEYSVL MD
2005-02-10 443-334-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J PIKESVILLE MD
2005-02-10 443-341-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J CATONSVL MD
2005-02-10 443-841-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J TOWSON MD
2005-02-05 443-569-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2005-02-05 443-827-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE 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.