NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 301-836

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 301-836 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 301 blocks

Most active assignees, all time — NPA 301
YMAX COMMUNICATIONS CORP. - MD 2
VERIZON MARYLAND, INC. 1
PAETEC ITEL, LLC 1
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 1
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 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
2013-08-12 301-836-0XXX 0000–0999Assigned IP HORIZON LLC 515J WSHNGTNZN5 MD
2010-12-22 301-836-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN5 MD
2012-10-04 301-836-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN5 MD
2011-01-13 301-836-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN5 MD
2010-12-10 301-836-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF MARYLAND, LLC - MD 7591 WSHNGTNZN5 MD
2010-08-23 301-836-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN5 MD
2010-08-23 301-836-6XXX 6000–6999Assigned YMAX COMMUNICATIONS CORP. - MD 281E WSHNGTNZN5 MD
— 301-836-7XXX 7000–7999Reserved VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
2015-06-23 301-836-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN5 MD
2004-02-27 301-836-9XXX 9000–9999Assigned PAETEC ITEL, LLC 829J WSHNGTNZN5 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.