NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

5 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 240
BANDWIDTH.COM CLEC, LLC - MD 3
OPENTACT INC. 1
ONVOY, 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
2018-10-11 240-407-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2018-10-11 240-518-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2018-10-11 240-530-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2018-10-11 240-530-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2018-10-11 240-530-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2018-10-11 240-530-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2018-10-11 240-530-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2018-10-11 240-544-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2018-10-11 240-548-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2018-10-11 240-548-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2018-10-11 240-548-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2018-10-11 240-548-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2018-10-11 240-548-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2018-10-11 240-585-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2018-10-11 240-585-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2018-10-11 240-585-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2018-10-11 240-624-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2018-10-11 240-637-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN3 MD
2018-10-11 240-637-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN3 MD
2018-10-11 240-754-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2018-10-11 240-754-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2018-10-11 240-754-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2018-10-11 240-754-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WALDORF MD
2018-10-11 240-846-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2018-10-11 240-867-0XXX 0000–0999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN3 MD
2018-10-11 240-867-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN3 MD
2018-10-11 240-867-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN3 MD
2018-10-11 240-867-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN3 MD
2018-10-11 240-897-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2018-10-11 240-897-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2018-10-11 240-897-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2018-10-11 240-897-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2018-10-10 240-267-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2018-10-10 240-267-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2018-10-10 240-267-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2018-10-10 240-267-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2018-10-10 240-267-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2018-10-10 240-537-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2018-10-10 240-537-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2018-10-10 240-537-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2018-10-10 240-537-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2018-10-10 240-537-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2018-10-10 240-537-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2018-10-10 240-537-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2018-10-10 240-576-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2018-10-10 240-576-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2018-10-10 240-576-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2018-10-10 240-576-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2018-10-09 240-831-3XXX 3000–3999Assigned NUSO, LLC 551G FREDERICK MD
2018-10-09 240-840-2XXX 2000–2999Assigned NUSO, LLC 551G FREDERICK 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.