Thousands-blocks in 336-490

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 336-490 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 336 blocks

Most active assignees, all time — NPA 336

ONVOY, LLC - NC 4

WINDSTREAM NORTH CAROLINA, INC. 1

TWC IP ENABLED SERVICES, LLC 1

TELEPORT COMMUNICATIONS AMERICA, LLC - NC 1

RANDOLPH TELEPHONE TELECOMMUNICATIONS, INC. - NC 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

Recent thousands-block assignments
Assigned	Thousands-block	Last 4 digits	Status	Assignee	OCN	Rate center	State
2013-02-26	336-490-0XXX	0000–0999	Assigned	TWC IP ENABLED SERVICES, LLC	793K	DENTON	NC
2024-02-02	336-490-1XXX	1000–1999	Assigned	ONVOY SPECTRUM, LLC	624H	DENTON	NC
2020-05-13	336-490-2XXX	2000–2999	Assigned	ONVOY, LLC - NC	638E	DENTON	NC
2011-09-02	336-490-3XXX	3000–3999	Assigned	WINDSTREAM NORTH CAROLINA, INC.	0476	DENTON	NC
2019-04-22	336-490-4XXX	4000–4999	Assigned	ONVOY, LLC - NC	638E	DENTON	NC
2020-05-13	336-490-5XXX	5000–5999	Assigned	ONVOY, LLC - NC	638E	DENTON	NC
2013-05-21	336-490-6XXX	6000–6999	Assigned	TELEPORT COMMUNICATIONS AMERICA, LLC - NC	8389	DENTON	NC
2015-05-07	336-490-7XXX	7000–7999	Assigned	LEVEL 3 COMMUNICATIONS, LLC - NC	3235	DENTON	NC
2015-08-27	336-490-8XXX	8000–8999	Assigned	RANDOLPH TELEPHONE TELECOMMUNICATIONS, INC. - NC	757D	DENTON	NC
2020-05-13	336-490-9XXX	9000–9999	Assigned	ONVOY, LLC - NC	638E	DENTON	NC

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.