NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 319-333

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026

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

The ten 1,000-number thousand-blocks inside prefix 319-333 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 319 blocks

Most active assignees, all time — NPA 319
NEW CINGULAR WIRELESS PCS, LLC - IL 3
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 3
T-MOBILE USA, INC. 1
ONVOY, LLC - IA 1
MCC TELEPHONY 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
2010-08-11 319-333-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E IOWA CITY IA
2010-03-19 319-333-1XXX 1000–1999Assigned MCC TELEPHONY LLC 593K IOWA CITY IA
2010-08-27 319-333-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 IOWA CITY IA
2011-04-22 319-333-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 IOWA CITY IA
2011-05-05 319-333-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 IOWA CITY IA
2011-03-17 319-333-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 IOWA CITY IA
2011-03-17 319-333-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 IOWA CITY IA
2011-01-10 319-333-7XXX 7000–7999Assigned ONVOY, LLC - IA 221F IOWA CITY IA
2011-01-06 319-333-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 IOWA CITY IA
2010-08-23 319-333-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 IOWA CITY IA

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.