NumberResearchThousands-blocks in 301-691
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 301-691 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 301 blocks
Most active assignees, all time — NPA 301
New assignments by month
Sep 2026
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Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2004-02-26 | 301-691-0XXX | 0000–0999 | Assigned | CORE COMMUNICATIONS, INC.- MD | 2593 | POOLESVL | MD |
| 2004-01-15 | 301-691-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | POOLESVL | MD |
| 2015-09-24 | 301-691-2XXX | 2000–2999 | Assigned | ONVOY, LLC - MD | 876D | POOLESVL | MD |
| 2012-09-11 | 301-691-3XXX | 3000–3999 | Assigned | ONVOY, LLC - MD | 876D | POOLESVL | MD |
| 2015-05-28 | 301-691-4XXX | 4000–4999 | Assigned | ONVOY, LLC - MD | 876D | POOLESVL | MD |
| 2013-04-04 | 301-691-5XXX | 5000–5999 | Assigned | PEERLESS NETWORK OF MARYLAND, LLC | 568G | POOLESVL | MD |
| 2015-05-27 | 301-691-6XXX | 6000–6999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | POOLESVL | MD |
| 2014-05-14 | 301-691-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | POOLESVL | MD |
| 2014-08-19 | 301-691-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 6395 | POOLESVL | MD |
| — | 301-691-9XXX | 9000–9999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | 7529 | POOLESVL | MD |
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.