NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

5 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 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
2019-04-15 240-828-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN4 MD
2019-04-15 240-828-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN4 MD
2019-04-15 240-828-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN4 MD
2019-04-15 240-828-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN4 MD
2019-04-15 240-828-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN4 MD
2019-04-15 240-843-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z13 MD
2019-04-15 240-843-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z13 MD
2019-04-15 240-843-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z13 MD
2019-04-15 240-843-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z13 MD
2019-04-15 240-843-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z13 MD
2019-04-15 240-843-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z13 MD
2019-04-15 240-843-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z13 MD
2019-04-15 240-846-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2019-04-15 240-846-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2019-04-15 240-897-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN16 MD
2019-04-12 240-598-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HUGHESVL MD
2019-04-12 240-598-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HUGHESVL MD
2019-04-12 240-633-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HUGHESVL MD
2019-04-12 240-635-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 TOMPKINSVL MD
2019-04-12 240-635-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 TOMPKINSVL MD
2019-04-12 240-635-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 TOMPKINSVL MD
2019-04-12 240-635-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 TOMPKINSVL MD
2019-04-12 240-842-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2019-04-12 240-842-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2019-04-12 240-842-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG238Z14 MD
2019-04-11 240-292-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN11 MD
2019-04-11 240-337-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN5 MD
2019-04-11 240-563-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN5 MD
2019-04-11 240-563-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSHNGTNZN5 MD
2019-04-11 240-642-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN10 MD
2019-04-11 240-642-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN10 MD
2019-04-11 240-642-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN10 MD
2019-04-11 240-642-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN10 MD
2019-04-11 240-642-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNGTNZN10 MD
2019-04-11 240-684-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z13 MD
2019-04-11 240-745-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC.- MD 2593 DAMASCS236 MD
2019-04-11 240-787-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BRANDYWINE MD
2019-03-28 240-531-9XXX 9000–9999Assigned IP HORIZON LLC 515J WSHNGTNZN3 MD
2019-03-28 240-564-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAUREL236 MD
2019-03-28 240-867-6XXX 6000–6999Assigned IP HORIZON LLC 515J WSHNGTNZN3 MD
2019-03-27 240-576-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-27 240-576-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-27 240-576-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-27 240-576-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-27 240-878-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-27 240-878-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-27 240-878-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-27 240-878-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-27 240-878-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-25 240-908-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 WALKERSVL 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.