NumberResearchThousands-blocks in 901-221
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
The ten 1,000-number thousand-blocks inside prefix 901-221 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 901 blocks
Most active assignees, all time — NPA 901
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 901-221-0XXX | 0000–0999 | Reserved | PAETEC ITEL, LLC | 829J | COLLIERVL | TN |
| 2006-01-24 | 901-221-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | COLLIERVL | TN |
| 2006-01-24 | 901-221-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | COLLIERVL | TN |
| 2006-01-24 | 901-221-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | COLLIERVL | TN |
| 2006-04-12 | 901-221-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | COLLIERVL | TN |
| 2006-05-17 | 901-221-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF TENNESSEE, LLC - TN | 7517 | COLLIERVL | TN |
| 2013-12-02 | 901-221-6XXX | 6000–6999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | COLLIERVL | TN |
| 2014-09-18 | 901-221-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | COLLIERVL | TN |
| 2008-03-18 | 901-221-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | COLLIERVL | TN |
| — | 901-221-9XXX | 9000–9999 | Reserved | PAETEC ITEL, LLC | 829J | COLLIERVL | TN |
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.