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
2012-09-06 443-886-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2012-08-24 443-660-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PIKESVILLE MD
2012-08-21 443-990-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2012-08-17 443-833-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ARBUTUS MD
2012-08-15 443-400-7XXX 7000–7999Assigned ONVOY, LLC - MD 876D BRYNPKLNCM MD
2012-08-14 443-372-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F EDGEWOOD MD
2012-08-14 443-372-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F EDGEWOOD MD
2012-08-10 443-931-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2012-08-08 443-598-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F SHERWD FOR MD
2012-08-07 443-201-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WESTMINSTR MD
2012-08-07 443-856-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 OCEAN CITY MD
2012-08-03 443-262-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CENTREVL MD
2012-07-31 443-948-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2012-07-05 443-450-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PIKESVILLE MD
2012-06-29 443-258-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J EASTON MD
2012-06-29 443-972-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J CAMBRIDGE MD
2012-06-27 443-295-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PRINCEFRCK MD
2012-06-25 443-862-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2012-06-25 443-862-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2012-06-25 443-862-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2012-06-25 443-886-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COCKEYSVL MD
2012-06-25 443-900-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2012-06-25 443-991-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2012-06-20 443-249-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 STEVENSVL MD
2012-06-20 443-258-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 EASTON MD
2012-06-20 443-434-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 FEDERALSBG MD
2012-06-20 443-515-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 CAMBRIDGE MD
2012-06-18 443-963-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BALTIMORE MD
2012-06-12 443-964-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J NORTHBEACH MD
2012-06-11 443-795-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J SEVERN MD
2012-06-05 443-900-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2012-06-05 443-900-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2012-06-05 443-900-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2012-06-04 443-966-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2012-05-31 443-666-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CHESTERTN MD
2012-05-23 443-900-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2012-05-23 443-900-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2012-05-23 443-900-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2012-05-23 443-900-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2012-05-23 443-900-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2012-05-23 443-900-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2012-05-21 443-679-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SEVERN MD
2012-05-18 443-699-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2012-05-18 443-771-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PRINCEFRCK MD
2012-05-18 443-771-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PRINCEFRCK MD
2012-05-18 443-771-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PRINCEFRCK MD
2012-05-18 443-771-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PRINCEFRCK MD
2012-05-18 443-771-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PRINCEFRCK MD
2012-05-18 443-952-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WESTMINSTR MD
2012-05-17 443-292-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D CROFTON 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.