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
2010-06-02 443-721-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2010-06-02 443-721-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2010-06-02 443-721-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2010-06-02 443-805-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2010-06-02 443-924-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2010-06-01 443-515-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J CAMBRIDGE MD
2010-05-28 443-203-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WEST RIVER MD
2010-05-28 443-216-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F DUNDALK MD
2010-05-28 443-272-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F RANDALLSTN MD
2010-05-28 443-305-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ARGRGBSNIS MD
2010-05-28 443-356-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BEL AIR MD
2010-05-28 443-422-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F GLENBURNIE MD
2010-05-28 443-440-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ANNAPOLIS MD
2010-05-28 443-470-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F TOWSON MD
2010-05-28 443-529-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2010-05-28 443-529-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2010-05-28 443-529-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2010-05-28 443-579-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ESSEX MD
2010-05-28 443-681-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2010-05-28 443-687-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2010-05-28 443-687-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2010-05-28 443-687-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2010-05-28 443-692-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2010-05-28 443-840-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CATONSVL MD
2010-05-21 443-810-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2010-05-21 443-873-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2010-05-21 443-873-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2010-05-20 443-764-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2010-05-11 443-470-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J TOWSON MD
2010-05-07 443-303-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ABERDEEN MD
2010-05-06 443-533-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J JARRETTSVL MD
2010-05-05 443-537-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2010-05-05 443-591-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2010-05-05 443-681-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2010-05-05 443-887-0XXX 0000–0999Assigned CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 3910 CATONSVL MD
2010-05-05 443-887-1XXX 1000–1999Assigned CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 3910 CATONSVL MD
2010-05-05 443-887-2XXX 2000–2999Assigned CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 3910 CATONSVL MD
2010-05-05 443-887-3XXX 3000–3999Assigned CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 3910 CATONSVL MD
2010-05-05 443-887-4XXX 4000–4999Assigned CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 3910 CATONSVL MD
2010-05-05 443-887-5XXX 5000–5999Assigned CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 3910 CATONSVL MD
2010-05-05 443-887-6XXX 6000–6999Assigned CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 3910 CATONSVL MD
2010-05-05 443-887-7XXX 7000–7999Assigned CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 3910 CATONSVL MD
2010-05-05 443-887-8XXX 8000–8999Assigned CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 3910 CATONSVL MD
2010-05-05 443-887-9XXX 9000–9999Assigned CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 3910 CATONSVL MD
2010-05-03 443-687-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2010-05-03 443-687-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2010-05-03 443-687-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2010-05-03 443-687-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2010-05-03 443-687-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2010-04-16 443-422-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GLENBURNIE 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.