NumberResearchThousands-blocks in 573-391
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 573-391 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 573 blocks
Most active assignees, all time — NPA 573
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
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2004-02-13 | 573-391-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | PORTAGEVL | MO |
| 2013-04-09 | 573-391-1XXX | 1000–1999 | Assigned | PEERLESS NETWORK OF MISSOURI, LLC - MO | 225F | PORTAGEVL | MO |
| 2021-12-07 | 573-391-2XXX | 2000–2999 | Assigned | TERRA NOVA TELECOM INC. | 145J | PORTAGEVL | MO |
| 2007-04-25 | 573-391-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | PORTAGEVL | MO |
| 2008-02-05 | 573-391-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | PORTAGEVL | MO |
| 2012-06-14 | 573-391-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MO | 993E | PORTAGEVL | MO |
| 2013-04-09 | 573-391-6XXX | 6000–6999 | Assigned | PEERLESS NETWORK OF MISSOURI, LLC - MO | 225F | PORTAGEVL | MO |
| 2008-11-06 | 573-391-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | PORTAGEVL | MO |
| 2012-11-06 | 573-391-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PORTAGEVL | MO |
| 2013-04-10 | 573-391-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7432 | PORTAGEVL | MO |
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.