NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

0 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, all time — NPA 302
BLOCK LINE SYSTEMS, LLC - DE 31
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
2013-05-06 302-477-7XXX 7000–7999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E WILMINGTON DE
2011-11-29 302-257-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E DOVER DE
2009-11-03 302-223-7XXX 7000–7999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E SMYRNA DE
2009-11-03 302-595-6XXX 6000–6999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E DELAWARECY DE
2009-08-26 302-238-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E GUMBORO DE
2009-08-26 302-746-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E HOLLY OAK DE
2009-05-27 302-232-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E BRIDGEVL DE
2009-05-27 302-272-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E CAMDEN DE
2009-05-27 302-564-6XXX 6000–6999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E SELBYVILLE DE
2009-05-27 302-664-6XXX 6000–6999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E MILTON DE
2009-05-27 302-725-6XXX 6000–6999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E MILFORD DE
2009-05-27 302-732-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E DAGSBORO DE
2009-05-27 302-754-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E GREENWOOD DE
2009-05-27 302-763-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E HOCKESSIN DE
2009-05-27 302-779-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E HARTLY DE
2009-05-27 302-786-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E HARRINGTON DE
2009-05-27 302-827-6XXX 6000–6999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E LEWES DE
2009-05-27 302-828-6XXX 6000–6999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E MIDDLETOWN DE
2009-05-27 302-829-6XXX 6000–6999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E OCEAN VIEW DE
2009-05-27 302-846-6XXX 6000–6999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E DELMAR DE
2009-05-27 302-865-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E FREDERICA DE
2009-05-27 302-870-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E FELTON DE
2009-05-27 302-877-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E LAUREL DE
2009-05-27 302-933-6XXX 6000–6999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E MILLSBORO DE
2009-05-27 302-966-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E ANGOLA DE
2009-05-27 302-990-7XXX 7000–7999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E SEAFORD DE
2009-05-20 302-362-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E GEORGETOWN DE
2009-05-20 302-669-3XXX 3000–3999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E NEW CASTLE DE
2009-05-20 302-864-6XXX 6000–6999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E REHOBOTH DE
2008-12-11 302-468-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E WILMINGTON DE
2007-10-24 302-781-4XXX 4000–4999Assigned BLOCK LINE SYSTEMS, LLC - DE 783E NEWARK DE

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.