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
2005-02-05 443-827-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2005-02-04 443-740-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2005-02-02 443-244-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WESTMINSTR MD
2005-02-02 443-426-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 RANDALLSTN MD
2005-02-01 443-231-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ESSEX MD
2005-02-01 443-503-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 DUNDALK MD
2005-01-30 443-445-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ELKRIDGE MD
2005-01-30 443-459-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ELKRIDGE MD
2005-01-26 443-877-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 NORTH EAST MD
2005-01-19 443-307-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR MD
2005-01-19 443-307-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR MD
2005-01-19 443-370-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2005-01-19 443-370-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2005-01-19 443-370-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2005-01-19 443-370-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2005-01-19 443-370-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2005-01-19 443-370-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2005-01-18 443-846-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2005-01-18 443-846-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2005-01-18 443-846-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2005-01-18 443-846-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2005-01-18 443-846-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2005-01-18 443-846-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2005-01-18 443-846-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2005-01-18 443-846-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2005-01-18 443-846-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2005-01-18 443-856-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 OCEAN CITY MD
2005-01-17 443-315-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-17 443-315-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-17 443-315-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-17 443-315-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-17 443-315-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-17 443-514-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-17 443-514-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-17 443-514-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-17 443-514-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-13 443-709-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ARBUTUS MD
2005-01-12 443-219-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PARKVILLE MD
2005-01-12 443-380-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WOODLAWN MD
2005-01-12 443-701-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 ARBUTUS MD
2005-01-10 443-293-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WESTMINSTR MD
2005-01-10 443-765-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-10 443-765-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-10 443-765-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-10 443-765-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-10 443-765-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-10 443-765-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-10 443-765-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-10 443-765-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
2005-01-05 443-632-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON 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.