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 781
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-11-04 | 781-488-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | ARLINGTON | MA |
| 2021-11-04 | 781-538-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | LEXINGTON | MA |
| 2021-11-04 | 781-627-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | MALDEN | MA |
| 2021-11-04 | 781-653-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BURLINGTON | MA |
| 2021-11-04 | 781-739-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CANTON | MA |
| 2021-11-04 | 781-783-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | HINGHAM | MA |
| 2021-11-04 | 781-796-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | BRAINTREE | MA |
| 2019-03-27 | 781-276-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | LEXINGTON | MA |
| 2019-03-27 | 781-490-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | NORWELL | MA |
| 2017-06-12 | 781-242-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | HULL | MA |
| 2017-06-12 | 781-427-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | NORWELL | MA |
| 2017-06-12 | 781-712-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | MELROSE | MA |
| 2017-06-08 | 781-483-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | ARLINGTON | MA |
| 2017-06-08 | 781-613-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | DEDHAM | MA |
| 2016-06-01 | 781-361-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | KINGSTON | MA |
| 2016-06-01 | 781-362-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | BURLINGTON | MA |
| 2016-06-01 | 781-421-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | ROCKLAND | MA |
| 2016-06-01 | 781-485-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | REVERE | MA |
| 2016-06-01 | 781-580-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | LYNNFIELD | MA |
| 2016-06-01 | 781-621-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | WAKEFIELD | MA |
| 2016-06-01 | 781-667-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | MALDEN | MA |
| 2016-06-01 | 781-701-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | WALTHAM | MA |
| 2016-06-01 | 781-705-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | WELLESLEY | MA |
| 2016-06-01 | 781-717-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | WINCHESTER | MA |
| 2016-06-01 | 781-725-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | NORWOOD | MA |
| 2016-06-01 | 781-739-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | CANTON | MA |
| 2016-06-01 | 781-797-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | MARBLEHEAD | MA |
| 2016-06-01 | 781-840-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | STOUGHTON | MA |
| 2016-06-01 | 781-908-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | HINGHAM | MA |
| 2016-06-01 | 781-909-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | READING | MA |
| 2016-06-01 | 781-923-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | COHASSET | MA |
| 2016-06-01 | 781-924-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | HANOVER | MA |
| 2016-06-01 | 781-954-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | STONEHAM | MA |
| 2016-06-01 | 781-957-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | MEDFORD | MA |
| 2016-06-01 | 781-980-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | BRAINTREE | MA |
| 2015-09-28 | 781-242-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | HULL | MA |
| 2015-09-28 | 781-463-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | LYNNFIELD | MA |
| 2015-09-28 | 781-527-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | COHASSET | MA |
| 2015-09-28 | 781-546-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | SCITUATE | MA |
| 2015-09-22 | 781-243-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | HANOVER | MA |
| 2015-09-22 | 781-563-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BRYANTVL | MA |
| 2015-09-22 | 781-806-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | SHARON | MA |
| 2015-09-16 | 781-425-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | BURLINGTON | MA |
| 2015-02-25 | 781-298-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | CANTON | MA |
| 2015-02-25 | 781-385-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | HINGHAM | MA |
| 2015-02-25 | 781-435-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | STONEHAM | MA |
| 2015-02-25 | 781-440-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | NORWOOD | MA |
| 2015-02-25 | 781-600-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | BRAINTREE | MA |
| 2015-02-25 | 781-625-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | WINCHESTER | MA |
| 2015-02-25 | 781-670-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | READING | 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.