NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
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, all time — NPA 339
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2012-02-21 | 339-201-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WEYMOUTH | MA |
| 2008-11-07 | 339-293-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MELROSE | MA |
| 2008-05-07 | 339-613-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | NORWELL | MA |
| 2008-04-30 | 339-970-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | LEXINGTON | MA |
| 2008-04-30 | 339-987-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | RANDOLPH | MA |
| 2008-04-16 | 339-219-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WAKEFIELD | MA |
| 2008-02-05 | 339-686-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WELLESLEY | MA |
| 2008-02-05 | 339-686-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WELLESLEY | MA |
| 2008-02-04 | 339-298-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WOBURN | MA |
| 2008-02-04 | 339-298-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WOBURN | MA |
| 2008-01-22 | 339-227-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WOBURN | MA |
| 2008-01-22 | 339-686-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WELLESLEY | MA |
| 2008-01-21 | 339-221-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MEDFORD | MA |
| 2008-01-21 | 339-234-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | BURLINGTON | MA |
| 2008-01-16 | 339-298-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WOBURN | MA |
| 2008-01-16 | 339-298-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WOBURN | MA |
| 2006-07-12 | 339-219-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WAKEFIELD | MA |
| 2006-05-22 | 339-368-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | ARLINGTON | MA |
| 2006-05-10 | 339-526-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | SCITUATE | MA |
| 2006-04-13 | 339-204-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | DEDHAM | MA |
| 2006-04-13 | 339-337-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | COHASSET | MA |
| 2006-03-16 | 339-987-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | RANDOLPH | MA |
| 2006-02-27 | 339-368-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | ARLINGTON | MA |
| 2005-12-28 | 339-244-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | BRYANTVL | MA |
| 2005-12-28 | 339-970-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | LEXINGTON | MA |
| 2005-12-28 | 339-970-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | LEXINGTON | MA |
| 2005-12-09 | 339-225-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | NEEDHAM | MA |
| 2005-12-09 | 339-225-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | NEEDHAM | MA |
| 2005-12-09 | 339-230-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | SHARON | MA |
| 2005-12-09 | 339-237-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | CANTON | MA |
| 2005-12-09 | 339-237-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | CANTON | MA |
| 2005-12-09 | 339-309-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | KINGSTON | MA |
| 2005-12-09 | 339-309-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | KINGSTON | MA |
| 2005-12-09 | 339-469-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | ROCKLAND | MA |
| 2005-12-09 | 339-469-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | ROCKLAND | MA |
| 2005-12-09 | 339-526-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | SCITUATE | MA |
| 2005-11-22 | 339-225-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | NEEDHAM | MA |
| 2005-11-22 | 339-225-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | NEEDHAM | MA |
| 2005-11-22 | 339-237-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | CANTON | MA |
| 2005-11-22 | 339-237-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | CANTON | MA |
| 2005-11-22 | 339-309-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | KINGSTON | MA |
| 2005-11-22 | 339-309-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | KINGSTON | MA |
| 2005-11-21 | 339-219-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WAKEFIELD | MA |
| 2005-11-16 | 339-499-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WEYMOUTH | MA |
| 2005-11-16 | 339-499-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WEYMOUTH | MA |
| 2005-11-11 | 339-200-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | HINGHAM | MA |
| 2005-11-11 | 339-200-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | HINGHAM | MA |
| 2005-11-11 | 339-368-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | ARLINGTON | MA |
| 2005-10-03 | 339-224-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MALDEN | MA |
| 2005-10-03 | 339-224-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MALDEN | MA |
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.