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
2018-09-11 443-363-7XXX 7000–7999Assigned METROPCS, INC. 5562 SEVERN MD
2018-09-11 443-420-2XXX 2000–2999Assigned METROPCS, INC. 5562 ELLICOTTCY MD
2018-09-10 443-533-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F JARRETTSVL MD
2018-09-07 443-933-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2018-09-07 443-933-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2018-09-07 443-933-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2018-09-04 443-596-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J ESSEX MD
2018-09-04 443-628-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J GLENBURNIE MD
2018-08-29 443-269-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2018-08-22 443-362-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 EASTON MD
2018-08-22 443-652-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 TOWSON MD
2018-08-21 443-705-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2018-08-21 443-705-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2018-08-20 443-446-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D QUEENSTOWN MD
2018-07-30 443-364-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ELLICOTTCY MD
2018-07-30 443-431-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 RANDALLSTN MD
2018-07-30 443-666-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CHESTERTN MD
2018-07-12 443-793-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PARKVILLE MD
2018-07-09 443-705-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2018-07-09 443-705-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2018-07-03 443-496-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D EASTON MD
2018-06-28 443-343-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F MILLERSVL MD
2018-06-28 443-582-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CHURCHVL MD
2018-06-28 443-609-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SYKESVILLE MD
2018-06-28 443-879-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F DUNDALK MD
2018-06-28 443-920-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SYKESVILLE MD
2018-06-25 443-264-8XXX 8000–8999Assigned NUSO, LLC 551G PIKESVILLE MD
2018-06-25 443-512-6XXX 6000–6999Assigned METROPCS, INC. 5562 EDGEWOOD MD
2018-06-20 443-953-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2018-06-20 443-953-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2018-06-19 443-720-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ABERDEEN MD
2018-06-13 443-227-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 PT DEPOSIT MD
2018-06-05 443-782-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 ANNAPOLIS MD
2018-05-30 443-269-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F TOWSON MD
2018-05-24 443-232-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WILLARDS MD
2018-05-24 443-232-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WILLARDS MD
2018-05-24 443-232-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WILLARDS MD
2018-05-24 443-233-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 VIENNA MD
2018-05-24 443-233-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 VIENNA MD
2018-05-24 443-234-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SNOW HILL MD
2018-05-24 443-234-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SNOW HILL MD
2018-05-24 443-323-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SHARPTOWN MD
2018-05-24 443-323-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 SHARPTOWN MD
2018-05-24 443-434-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FEDERALSBG MD
2018-05-24 443-434-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FEDERALSBG MD
2018-05-24 443-434-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 FEDERALSBG MD
2018-05-24 443-493-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DELMAR MD
2018-05-24 443-665-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NANTICOKE MD
2018-05-24 443-665-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NANTICOKE MD
2018-05-24 443-665-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 NANTICOKE 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.