NumberResearchRecent thousands-block assignments
0 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, all time — NPA 508
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2019-03-27 | 508-206-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | NATICK | MA |
| 2019-03-27 | 508-348-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | CHATHAM | MA |
| 2019-03-27 | 508-365-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | WORCESTER | MA |
| 2019-03-27 | 508-437-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | BARNSTABLE | MA |
| 2019-03-27 | 508-440-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | FRANKLIN | MA |
| 2019-03-27 | 508-519-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | WORCESTER | MA |
| 2017-06-12 | 508-461-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | WEBSTER | MA |
| 2017-06-12 | 508-632-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | HARWICH | MA |
| 2016-05-27 | 508-392-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CATAUMET | MA |
| 2016-05-27 | 508-499-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | OXFORD | MA |
| 2016-05-27 | 508-529-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | UPTON | MA |
| 2016-05-27 | 508-680-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | NANTUCKET | MA |
| 2016-05-27 | 508-893-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | HOLLISTON | MA |
| 2015-09-24 | 508-379-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | NO SWANSEA | MA |
| 2015-09-24 | 508-399-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | SOUTHGATE | MA |
| 2015-09-24 | 508-506-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | OXFORD | MA |
| 2015-09-24 | 508-794-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | MILLIS | MA |
| 2015-09-24 | 508-882-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | OAKHAM | MA |
| 2015-09-22 | 508-242-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | MEDFIELD | MA |
| 2015-09-22 | 508-392-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | CATAUMET | MA |
| 2015-09-22 | 508-538-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | MARION | MA |
| 2015-09-22 | 508-955-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | CHILMARK | MA |
| 2015-02-24 | 508-576-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | NO ATTLEBO | MA |
| 2015-02-24 | 508-694-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | DENNIS | MA |
| 2015-02-24 | 508-819-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | BRIDGEWTR | MA |
| 2015-02-24 | 508-850-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | WALPOLE | MA |
| 2015-02-24 | 508-960-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | NATICK | MA |
| 2013-03-25 | 508-598-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | FRAMINGHAM | MA |
| 2013-03-18 | 508-696-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | VINEYRDHVN | MA |
| 2013-03-18 | 508-792-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | WORCESTER | MA |
| 2013-03-15 | 508-306-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | HOLLISTON | MA |
| 2013-03-15 | 508-690-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | EBRIDGEWTR | MA |
| 2009-02-05 | 508-488-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | MILFORD | MA |
| 2002-03-08 | 508-474-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | HOLLISTON | MA |
| 2002-03-08 | 508-886-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | RUTLAND | MA |
| 2002-03-08 | 508-924-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | EBRIDGEWTR | 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.