NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 331-212

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 331-212 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 331 blocks

Most active assignees, all time — NPA 331
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 3
PEERLESS NETWORK OF ILLINOIS, LLC - IL 2
COMCAST IP PHONE, LLC 2
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 1
LEVEL 3 COMMUNICATIONS, LLC - IL 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
2012-06-18 331-212-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2012-06-18 331-212-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2012-06-18 331-212-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 AURORA IL
2012-04-06 331-212-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 AURORA IL
2012-05-24 331-212-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 AURORA IL
2012-08-17 331-212-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J AURORA IL
2012-11-21 331-212-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J AURORA IL
2012-06-04 331-212-7XXX 7000–7999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L AURORA IL
2013-04-03 331-212-8XXX 8000–8999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E AURORA IL
2013-04-03 331-212-9XXX 9000–9999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E AURORA IL

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.