NumberResearchRecent thousands-block assignments
2 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, last 30 days — NPA 857
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 |
|---|---|---|---|---|---|---|---|
| 2005-09-23 | 857-413-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | BOSTON | MA |
| 2005-09-23 | 857-413-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | BOSTON | MA |
| 2005-09-19 | 857-488-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BOSTON | MA |
| 2005-09-09 | 857-209-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | CAMBRIDGE | MA |
| 2005-09-09 | 857-998-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | CAMBRIDGE | MA |
| 2005-09-09 | 857-998-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | CAMBRIDGE | MA |
| 2005-09-07 | 857-753-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BOSTON | MA |
| 2005-09-07 | 857-753-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BOSTON | MA |
| 2005-09-07 | 857-998-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | CAMBRIDGE | MA |
| 2005-08-19 | 857-221-2XXX | 2000–2999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2005-08-19 | 857-753-5XXX | 5000–5999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2005-08-19 | 857-753-6XXX | 6000–6999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2005-08-19 | 857-753-7XXX | 7000–7999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2005-08-19 | 857-753-8XXX | 8000–8999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2005-08-19 | 857-753-9XXX | 9000–9999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2005-08-16 | 857-221-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | BOSTON | MA |
| 2005-08-16 | 857-221-4XXX | 4000–4999 | Assigned | TC SYSTEMS, INC. | 7135 | BOSTON | MA |
| 2005-08-16 | 857-221-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | BOSTON | MA |
| 2005-08-16 | 857-221-8XXX | 8000–8999 | Assigned | PAETEC ITEL, LLC | 829J | BOSTON | MA |
| 2005-08-16 | 857-221-9XXX | 9000–9999 | Assigned | PAETEC ITEL, LLC | 829J | BOSTON | MA |
| 2005-08-15 | 857-753-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BOSTON | MA |
| 2005-08-15 | 857-753-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | BOSTON | MA |
| 2005-08-01 | 857-756-1XXX | 1000–1999 | Assigned | METROPOLITAN TELECOMMUNICATIONS OF MASS DBA METTEL | 0334 | CAMBRIDGE | MA |
| 2005-06-28 | 857-453-0XXX | 0000–0999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2005-06-28 | 857-453-9XXX | 9000–9999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | BOSTON | MA |
| 2005-06-15 | 857-221-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | BOSTON | MA |
| 2005-06-15 | 857-221-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | BOSTON | MA |
| 2005-06-03 | 857-816-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | WINTHROP | MA |
| 2005-06-02 | 857-221-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | BOSTON | MA |
| 2005-05-26 | 857-453-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | BOSTON | MA |
| 2005-05-26 | 857-453-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | BOSTON | MA |
| 2005-05-26 | 857-453-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | BOSTON | MA |
| 2005-05-26 | 857-453-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | BOSTON | MA |
| 2005-04-08 | 857-472-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BOSTON | MA |
| 2005-04-08 | 857-472-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BOSTON | MA |
| 2005-04-08 | 857-472-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BOSTON | MA |
| 2005-03-08 | 857-203-3XXX | 3000–3999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | JAMAICA PL | MA |
| 2005-03-08 | 857-203-4XXX | 4000–4999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | JAMAICA PL | MA |
| 2005-03-08 | 857-203-5XXX | 5000–5999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | JAMAICA PL | MA |
| 2005-03-08 | 857-203-6XXX | 6000–6999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | JAMAICA PL | MA |
| 2005-02-15 | 857-364-2XXX | 2000–2999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BROOKLINE | MA |
| 2005-02-15 | 857-364-3XXX | 3000–3999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BROOKLINE | MA |
| 2005-02-15 | 857-364-4XXX | 4000–4999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BROOKLINE | MA |
| 2005-02-15 | 857-364-5XXX | 5000–5999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BROOKLINE | MA |
| 2005-02-15 | 857-364-6XXX | 6000–6999 | Assigned | VERIZON NEW ENGLAND INC. | 9102 | BROOKLINE | MA |
| 2005-01-15 | 857-598-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MILTON | MA |
| 2004-12-20 | 857-598-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MILTON | MA |
| 2004-11-23 | 857-496-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | SO BOSTON | MA |
| 2004-08-09 | 857-776-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | CHELSEA | MA |
| 2004-08-09 | 857-816-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WINTHROP | MA |
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.