NumberResearchThousands-blocks in 276-421
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026
The ten 1,000-number thousand-blocks inside prefix 276-421 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 276 blocks
Most active assignees, all time — NPA 276
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
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Apr 2026
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Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-06-28 | 276-421-0XXX | 0000–0999 | Assigned | ONVOY, LLC - VA | 138E | BASSETT | VA |
| 2020-10-05 | 276-421-1XXX | 1000–1999 | Assigned | ONVOY, LLC - VA | 138E | BASSETT | VA |
| 2012-02-07 | 276-421-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | BASSETT | VA |
| 2016-06-17 | 276-421-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BASSETT | VA |
| 2020-03-05 | 276-421-4XXX | 4000–4999 | Assigned | ONVOY, LLC - VA | 138E | BASSETT | VA |
| 2015-08-20 | 276-421-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | BASSETT | VA |
| 2016-08-05 | 276-421-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - VA | 4644 | BASSETT | VA |
| 2013-11-12 | 276-421-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - VA | 8825 | BASSETT | VA |
| 2020-10-05 | 276-421-8XXX | 8000–8999 | Assigned | ONVOY, LLC - VA | 138E | BASSETT | VA |
| 2026-06-30 | 276-421-9XXX | 9000–9999 | Assigned | ONVOY, LLC - VA | 138E | BASSETT | VA |
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.