NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 318-558

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 318-558 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 318 blocks

Most active assignees, all time — NPA 318
ONVOY, LLC - LA 5
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - LA 2
TELEPORT COMMUNICATIONS AMERICA LA - LLC 1
ONVOY SPECTRUM, LLC 1
LEVEL 3 COMMUNICATIONS, LLC - LA 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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
— 318-558-0XXX 0000–0999Reserved CELLCO PARTNERSHIP DBA VERIZON WIRELESS - LA 6505 MARION LA
— 318-558-1XXX 1000–1999Reserved CELLCO PARTNERSHIP DBA VERIZON WIRELESS - LA 6505 MARION LA
2021-01-26 318-558-2XXX 2000–2999Assigned ONVOY, LLC - LA 749E MARION LA
2021-01-26 318-558-3XXX 3000–3999Assigned ONVOY, LLC - LA 749E MARION LA
2016-04-25 318-558-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA LA - LLC 653C MARION LA
2023-06-21 318-558-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H MARION LA
2019-03-01 318-558-6XXX 6000–6999Assigned ONVOY, LLC - LA 749E MARION LA
2014-08-06 318-558-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - LA 3232 MARION LA
2018-09-27 318-558-8XXX 8000–8999Assigned ONVOY, LLC - LA 749E MARION LA
2019-03-01 318-558-9XXX 9000–9999Assigned ONVOY, LLC - LA 749E MARION LA

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.