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 351
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 |
|---|---|---|---|---|---|---|---|
| 2016-04-18 | 351-999-3XXX | 3000–3999 | Assigned | HD CARRIER LLC | 321J | MANCHESTER | MA |
| 2016-04-18 | 351-999-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | MANCHESTER | MA |
| 2016-04-18 | 351-999-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | MANCHESTER | MA |
| 2016-04-18 | 351-999-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | MANCHESTER | MA |
| 2016-03-31 | 351-444-4XXX | 4000–4999 | Assigned | ONVOY, LLC - MA | 892D | IPSWICH | MA |
| 2016-03-18 | 351-333-1XXX | 1000–1999 | Assigned | ONVOY, LLC - MA | 892D | HARVARD | MA |
| 2016-03-18 | 351-333-4XXX | 4000–4999 | Assigned | ONVOY, LLC - MA | 892D | HARVARD | MA |
| 2016-02-26 | 351-999-7XXX | 7000–7999 | Assigned | ONVOY, LLC - MA | 892D | MANCHESTER | MA |
| 2016-02-26 | 351-999-8XXX | 8000–8999 | Assigned | ONVOY, LLC - MA | 892D | MANCHESTER | MA |
| 2016-02-25 | 351-777-1XXX | 1000–1999 | Assigned | ONVOY, LLC - MA | 892D | HUBBARDSTN | MA |
| 2016-02-25 | 351-777-2XXX | 2000–2999 | Assigned | ONVOY, LLC - MA | 892D | HUBBARDSTN | MA |
| 2016-02-25 | 351-888-1XXX | 1000–1999 | Assigned | ONVOY, LLC - MA | 892D | MERRIMAC | MA |
| 2016-02-25 | 351-888-2XXX | 2000–2999 | Assigned | ONVOY, LLC - MA | 892D | MERRIMAC | MA |
| 2015-12-30 | 351-207-3XXX | 3000–3999 | Assigned | ONVOY, LLC - MA | 892D | GEORGETOWN | MA |
| 2015-12-02 | 351-333-9XXX | 9000–9999 | Assigned | BARR TELL USA, INC. - MA | 732H | HARVARD | MA |
| 2015-09-28 | 351-999-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | MANCHESTER | MA |
| 2015-09-22 | 351-207-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | GEORGETOWN | MA |
| 2015-09-22 | 351-888-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | MERRIMAC | MA |
| 2015-08-25 | 351-207-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | GEORGETOWN | MA |
| 2015-08-25 | 351-333-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | HARVARD | MA |
| 2015-08-17 | 351-888-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | MERRIMAC | MA |
| 2015-06-26 | 351-999-9XXX | 9000–9999 | Assigned | ONVOY, LLC - MA | 892D | MANCHESTER | MA |
| 2015-04-30 | 351-777-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | HUBBARDSTN | MA |
| 2015-04-16 | 351-207-4XXX | 4000–4999 | Assigned | ONVOY, LLC - MA | 892D | GEORGETOWN | MA |
| 2015-01-26 | 351-207-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | GEORGETOWN | MA |
| 2014-08-29 | 351-888-8XXX | 8000–8999 | Assigned | ONVOY, LLC - MA | 892D | MERRIMAC | MA |
| 2014-08-28 | 351-207-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | GEORGETOWN | MA |
| 2014-08-22 | 351-333-3XXX | 3000–3999 | Assigned | ONVOY, LLC - MA | 892D | HARVARD | MA |
| 2014-08-22 | 351-777-7XXX | 7000–7999 | Assigned | ONVOY, LLC - MA | 892D | HUBBARDSTN | MA |
| 2014-08-05 | 351-201-3XXX | 3000–3999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | DANVERS | MA |
| 2014-08-05 | 351-201-4XXX | 4000–4999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | DANVERS | MA |
| 2014-08-05 | 351-201-5XXX | 5000–5999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | DANVERS | MA |
| 2014-08-05 | 351-201-7XXX | 7000–7999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | DANVERS | MA |
| 2014-08-05 | 351-201-8XXX | 8000–8999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | DANVERS | MA |
| 2014-05-16 | 351-207-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | GEORGETOWN | MA |
| 2014-05-15 | 351-207-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | GEORGETOWN | MA |
| 2013-01-09 | 351-206-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | ROCKPORT | MA |
| 2013-01-09 | 351-206-1XXX | 1000–1999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | ROCKPORT | MA |
| 2013-01-09 | 351-206-2XXX | 2000–2999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | ROCKPORT | MA |
| 2013-01-09 | 351-206-4XXX | 4000–4999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | ROCKPORT | MA |
| 2013-01-09 | 351-206-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | ROCKPORT | MA |
| 2013-01-03 | 351-202-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | PEPPERELL | MA |
| 2013-01-03 | 351-202-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | PEPPERELL | MA |
| 2013-01-03 | 351-202-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | PEPPERELL | MA |
| 2012-08-31 | 351-202-1XXX | 1000–1999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | PEPPERELL | MA |
| 2012-08-31 | 351-202-2XXX | 2000–2999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | PEPPERELL | MA |
| 2012-08-31 | 351-202-3XXX | 3000–3999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | PEPPERELL | MA |
| 2012-08-31 | 351-202-4XXX | 4000–4999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | PEPPERELL | MA |
| 2012-08-31 | 351-202-5XXX | 5000–5999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | PEPPERELL | MA |
| 2012-08-31 | 351-202-6XXX | 6000–6999 | Assigned | PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 268F | PEPPERELL | 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.