NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 301
VERIZON MARYLAND, INC. 89
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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2014-04-08 301-546-0XXX 0000–0999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
2014-04-08 301-546-1XXX 1000–1999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
2014-04-08 301-546-2XXX 2000–2999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
2014-04-08 301-546-3XXX 3000–3999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
2014-04-08 301-546-4XXX 4000–4999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
2014-04-08 301-546-5XXX 5000–5999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
2014-04-08 301-546-6XXX 6000–6999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
2014-04-08 301-546-7XXX 7000–7999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
2014-04-08 301-546-8XXX 8000–8999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
2014-04-08 301-546-9XXX 9000–9999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
2013-01-28 301-298-4XXX 4000–4999Assigned VERIZON MARYLAND, INC. 9212 WSNG236Z15 MD
2013-01-28 301-971-5XXX 5000–5999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN6 MD
2013-01-28 301-971-6XXX 6000–6999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN6 MD
2012-11-13 301-966-1XXX 1000–1999Assigned VERIZON MARYLAND, INC. 9212 WSNGTNZN12 MD
2012-11-13 301-966-4XXX 4000–4999Assigned VERIZON MARYLAND, INC. 9212 WSNGTNZN12 MD
2012-11-13 301-966-5XXX 5000–5999Assigned VERIZON MARYLAND, INC. 9212 WSNGTNZN12 MD
2012-11-13 301-966-8XXX 8000–8999Assigned VERIZON MARYLAND, INC. 9212 WSNGTNZN12 MD
2011-01-17 301-777-6XXX 6000–6999Assigned VERIZON MARYLAND, INC. 9212 CUMBERLAND MD
2010-03-31 301-400-0XXX 0000–0999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2010-03-31 301-400-1XXX 1000–1999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2010-03-31 301-400-2XXX 2000–2999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2010-03-31 301-400-3XXX 3000–3999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2010-03-31 301-400-4XXX 4000–4999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2010-03-31 301-400-5XXX 5000–5999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2010-03-31 301-400-6XXX 6000–6999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2010-03-31 301-400-7XXX 7000–7999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2010-03-31 301-400-8XXX 8000–8999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2010-03-31 301-400-9XXX 9000–9999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2007-11-29 301-539-7XXX 7000–7999Assigned VERIZON MARYLAND, INC. 9212 LA PLATA MD
2007-11-08 301-447-8XXX 8000–8999Assigned VERIZON MARYLAND, INC. 9212 EMMITSBURG MD
2007-07-31 301-355-5XXX 5000–5999Assigned VERIZON MARYLAND, INC. 9212 GAITHERSBG MD
2007-07-31 301-355-6XXX 6000–6999Assigned VERIZON MARYLAND, INC. 9212 GAITHERSBG MD
2007-07-31 301-355-7XXX 7000–7999Assigned VERIZON MARYLAND, INC. 9212 GAITHERSBG MD
2007-03-28 301-965-4XXX 4000–4999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN6 MD
2007-01-18 301-377-7XXX 7000–7999Assigned VERIZON MARYLAND, INC. 9212 LAUREL236 MD
2006-12-20 301-444-4XXX 4000–4999Assigned VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
2006-11-09 301-825-7XXX 7000–7999Assigned VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
2006-07-25 301-243-0XXX 0000–0999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2006-07-25 301-243-1XXX 1000–1999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2006-07-25 301-243-2XXX 2000–2999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2006-07-25 301-243-3XXX 3000–3999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2006-07-25 301-243-4XXX 4000–4999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2006-07-25 301-243-5XXX 5000–5999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2006-07-25 301-243-6XXX 6000–6999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2006-07-25 301-243-7XXX 7000–7999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2006-07-25 301-243-8XXX 8000–8999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2006-07-25 301-243-9XXX 9000–9999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
2006-07-07 301-600-0XXX 0000–0999Assigned VERIZON MARYLAND, INC. 9212 FREDERICK MD
2006-07-07 301-600-1XXX 1000–1999Assigned VERIZON MARYLAND, INC. 9212 FREDERICK MD
2006-07-07 301-600-2XXX 2000–2999Assigned VERIZON MARYLAND, INC. 9212 FREDERICK MD

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.