NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 318-731

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 318-731 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
ONVOY SPECTRUM, LLC 1
LEVEL 3 COMMUNICATIONS, LLC - LA 1
COMCAST IP PHONE, LLC 1
BANDWIDTH.COM CLEC, 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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2016-05-25 318-731-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - LA 153F VIVIAN LA
2018-09-27 318-731-1XXX 1000–1999Assigned ONVOY, LLC - LA 749E VIVIAN LA
2023-05-02 318-731-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J VIVIAN LA
2019-03-19 318-731-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - LA 3232 VIVIAN LA
2023-06-22 318-731-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H VIVIAN LA
— 318-731-5XXX 5000–5999Available VIVIAN LA
2021-01-26 318-731-6XXX 6000–6999Assigned ONVOY, LLC - LA 749E VIVIAN LA
2021-01-26 318-731-7XXX 7000–7999Assigned ONVOY, LLC - LA 749E VIVIAN LA
2019-03-01 318-731-8XXX 8000–8999Assigned ONVOY, LLC - LA 749E VIVIAN LA
2019-03-01 318-731-9XXX 9000–9999Assigned ONVOY, LLC - LA 749E VIVIAN LA

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.