NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/26/2026
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 203
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 |
|---|---|---|---|---|---|---|---|
| 2014-06-17 | 203-693-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | MILFORD | CT |
| 2014-04-04 | 203-290-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | BRIDGEPORT | CT |
| 2013-04-05 | 203-968-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | STAMFORD | CT |
| 2012-11-01 | 203-680-1XXX | 1000–1999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2012-11-01 | 203-680-2XXX | 2000–2999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2012-11-01 | 203-680-4XXX | 4000–4999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2012-11-01 | 203-680-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2012-11-01 | 203-680-6XXX | 6000–6999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2012-11-01 | 203-680-7XXX | 7000–7999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2011-09-12 | 203-448-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | DANBURY | CT |
| 2011-08-18 | 203-697-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | WALLINGFD | CT |
| 2011-08-18 | 203-697-7XXX | 7000–7999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | WALLINGFD | CT |
| 2011-08-01 | 203-842-7XXX | 7000–7999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NORWALK | CT |
| 2011-06-23 | 203-408-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | REDDING | CT |
| 2011-06-23 | 203-544-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | GEORGETOWN | CT |
| 2011-06-23 | 203-586-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | WOODBURY | CT |
| 2011-05-26 | 203-677-4XXX | 4000–4999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | WALLINGFD | CT |
| 2011-05-26 | 203-677-8XXX | 8000–8999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | WALLINGFD | CT |
| 2011-05-26 | 203-677-9XXX | 9000–9999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | WALLINGFD | CT |
| 2011-04-14 | 203-633-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | WOLCOTT | CT |
| 2011-03-25 | 203-916-8XXX | 8000–8999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | BRIDGEPORT | CT |
| 2010-03-11 | 203-463-0XXX | 0000–0999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | SEYMOUR | CT |
| 2010-02-19 | 203-962-0XXX | 0000–0999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | STAMFORD | CT |
| 2010-01-13 | 203-873-6XXX | 6000–6999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | BRIDGEPORT | CT |
| 2009-10-09 | 203-903-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2009-05-20 | 203-200-1XXX | 1000–1999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2009-05-20 | 203-200-2XXX | 2000–2999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2009-05-20 | 203-200-3XXX | 3000–3999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2009-05-20 | 203-200-4XXX | 4000–4999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2009-05-20 | 203-200-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2009-05-20 | 203-200-6XXX | 6000–6999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2008-09-03 | 203-936-0XXX | 0000–0999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2008-09-03 | 203-936-1XXX | 1000–1999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2008-09-03 | 203-936-2XXX | 2000–2999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2008-09-03 | 203-936-3XXX | 3000–3999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2008-09-03 | 203-936-4XXX | 4000–4999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2008-09-03 | 203-936-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW HAVEN | CT |
| 2008-07-14 | 203-689-4XXX | 4000–4999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | GUILFORD | CT |
| 2008-02-01 | 203-275-4XXX | 4000–4999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | BRIDGEPORT | CT |
| 2008-01-30 | 203-275-1XXX | 1000–1999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | BRIDGEPORT | CT |
| 2008-01-30 | 203-275-2XXX | 2000–2999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | BRIDGEPORT | CT |
| 2008-01-30 | 203-275-3XXX | 3000–3999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | BRIDGEPORT | CT |
| 2007-08-10 | 203-304-8XXX | 8000–8999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEWTOWN | CT |
| 2007-08-10 | 203-350-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | MADISON | CT |
| 2007-08-10 | 203-403-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | RIDGEFIELD | CT |
| 2007-08-10 | 203-424-5XXX | 5000–5999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | DARIEN | CT |
| 2007-08-10 | 203-457-7XXX | 7000–7999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | GUILFORD | CT |
| 2007-08-10 | 203-563-4XXX | 4000–4999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | WILTON | CT |
| 2007-08-10 | 203-594-2XXX | 2000–2999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NEW CANAAN | CT |
| 2007-08-10 | 203-714-7XXX | 7000–7999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | NAUGATUCK | CT |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.