NumberResearchRecent thousands-block assignments
17 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, last 30 days — NPA 443
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-06-01 | 443-625-4XXX | 4000–4999 | Assigned | ONVOY, LLC - MD | 876D | FORK | MD |
| 2015-06-01 | 443-679-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 6395 | SEVERN | MD |
| 2015-06-01 | 443-754-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 6395 | SALISBURY | MD |
| 2015-06-01 | 443-903-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 6395 | BEL AIR | MD |
| 2015-05-27 | 443-210-0XXX | 0000–0999 | Assigned | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 6855 | SALISBURY | MD |
| 2015-05-27 | 443-210-1XXX | 1000–1999 | Assigned | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 6855 | SALISBURY | MD |
| 2015-05-27 | 443-663-0XXX | 0000–0999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | WOODLAWN | MD |
| 2015-05-27 | 443-914-5XXX | 5000–5999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | WORTHINGTN | MD |
| 2015-05-20 | 443-342-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | SOLOMONS | MD |
| 2015-05-20 | 443-526-9XXX | 9000–9999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | HAVREGRACE | MD |
| 2015-05-20 | 443-639-6XXX | 6000–6999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | HAMPSTEAD | MD |
| 2015-05-18 | 443-419-8XXX | 8000–8999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | GLENWOOD | MD |
| 2015-05-18 | 443-456-9XXX | 9000–9999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | EDGEWOOD | MD |
| 2015-05-18 | 443-504-6XXX | 6000–6999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | FALLSTON | MD |
| 2015-05-18 | 443-585-5XXX | 5000–5999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | DARLINGTON | MD |
| 2015-05-18 | 443-776-6XXX | 6000–6999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | ELKRIDGE | MD |
| 2015-05-18 | 443-941-1XXX | 1000–1999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | ELKTON | MD |
| 2015-05-12 | 443-457-4XXX | 4000–4999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | BRYNPKLNCM | MD |
| 2015-05-12 | 443-933-3XXX | 3000–3999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | COCKEYSVL | MD |
| 2015-05-06 | 443-201-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | WESTMINSTR | MD |
| 2015-05-06 | 443-436-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | WOODLAWN | MD |
| 2015-05-06 | 443-457-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | BRYNPKLNCM | MD |
| 2015-05-06 | 443-607-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | WEST RIVER | MD |
| 2015-05-06 | 443-819-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | BEL AIR | MD |
| 2015-05-05 | 443-266-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | GLENWOOD | MD |
| 2015-05-05 | 443-353-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | COCKEYSVL | MD |
| 2015-05-05 | 443-390-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | CHURCHVL | MD |
| 2015-05-05 | 443-583-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | COLUMBIA | MD |
| 2015-05-05 | 443-626-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | CHASE | MD |
| 2015-05-05 | 443-639-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | HAMPSTEAD | MD |
| 2015-05-05 | 443-646-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | NORTHBEACH | MD |
| 2015-05-04 | 443-775-6XXX | 6000–6999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | ANNAPOLIS | MD |
| 2015-05-01 | 443-549-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | DUNDALK | MD |
| 2015-04-23 | 443-399-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | DUNDALK | MD |
| 2015-04-23 | 443-399-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | DUNDALK | MD |
| 2015-04-23 | 443-593-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | ELKTON | MD |
| 2015-04-23 | 443-593-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | ELKTON | MD |
| 2015-04-22 | 443-328-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | SYKESVILLE | MD |
| 2015-04-22 | 443-328-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | SYKESVILLE | MD |
| 2015-04-22 | 443-339-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | SHERWD FOR | MD |
| 2015-04-22 | 443-339-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | SHERWD FOR | MD |
| 2015-04-22 | 443-499-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | JARRETTSVL | MD |
| 2015-04-22 | 443-499-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | JARRETTSVL | MD |
| 2015-04-21 | 443-584-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | CROFTON | MD |
| 2015-04-21 | 443-584-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | CROFTON | MD |
| 2015-04-21 | 443-585-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | DARLINGTON | MD |
| 2015-04-21 | 443-585-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | DARLINGTON | MD |
| 2015-04-14 | 443-308-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | SEVERN | MD |
| 2015-04-14 | 443-308-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | SEVERN | MD |
| 2015-04-14 | 443-583-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | COLUMBIA | 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.