NumberResearchRecent thousands-block assignments
2 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 410
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 |
|---|---|---|---|---|---|---|---|
| 2015-10-30 | 410-204-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | ARBUTUS | MD |
| 2015-10-30 | 410-988-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | ELLICOTTCY | MD |
| 2015-10-28 | 410-831-0XXX | 0000–0999 | Assigned | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 6855 | SALISBURY | MD |
| 2015-10-28 | 410-831-1XXX | 1000–1999 | Assigned | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 6855 | SALISBURY | MD |
| 2015-10-27 | 410-559-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | PIKESVILLE | MD |
| 2015-10-22 | 410-831-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | SALISBURY | MD |
| 2015-10-05 | 410-624-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | BALTIMORE | MD |
| 2015-09-21 | 410-505-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF MARYLAND, LLC | 568G | ELLICOTTCY | MD |
| 2015-09-15 | 410-372-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | TOWSON | MD |
| 2015-09-09 | 410-424-8XXX | 8000–8999 | Assigned | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 6855 | GLENBURNIE | MD |
| 2015-09-09 | 410-424-9XXX | 9000–9999 | Assigned | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 6855 | GLENBURNIE | MD |
| 2015-09-01 | 410-624-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | BALTIMORE | MD |
| 2015-08-18 | 410-874-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | 7228 | ODENTON | MD |
| 2015-08-11 | 410-957-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | POCOMOKE | MD |
| 2015-07-23 | 410-525-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | BALTIMORE | MD |
| 2015-07-23 | 410-525-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | BALTIMORE | MD |
| 2015-07-20 | 410-421-7XXX | 7000–7999 | Assigned | ONVOY, LLC - MD | 876D | SEVERNA PK | MD |
| 2015-07-16 | 410-589-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | BRYNPKLNCM | MD |
| 2015-07-16 | 410-901-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | CAMBRIDGE | MD |
| 2015-07-15 | 410-216-5XXX | 5000–5999 | Assigned | ONVOY, LLC - MD | 876D | ANNAPOLIS | MD |
| 2015-07-14 | 410-593-1XXX | 1000–1999 | Assigned | ONVOY, LLC - MD | 876D | FORK | MD |
| 2015-07-06 | 410-572-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | SALISBURY | MD |
| 2015-06-23 | 410-324-9XXX | 9000–9999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | TOWSON | MD |
| 2015-06-23 | 410-390-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | OCEAN CITY | MD |
| 2015-06-17 | 410-862-2XXX | 2000–2999 | Assigned | ONVOY, LLC - MD | 876D | WATERLO236 | MD |
| 2015-06-15 | 410-205-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | PIKESVILLE | MD |
| 2015-06-09 | 410-705-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | WATERLO236 | MD |
| 2015-06-09 | 410-772-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | COLUMBIA | MD |
| 2015-06-08 | 410-216-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | ANNAPOLIS | MD |
| 2015-06-08 | 410-831-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | SALISBURY | MD |
| 2015-05-27 | 410-741-7XXX | 7000–7999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | WEST RIVER | MD |
| 2015-05-20 | 410-692-1XXX | 1000–1999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | JARRETTSVL | MD |
| 2015-05-18 | 410-238-9XXX | 9000–9999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | ESSEX | MD |
| 2015-05-18 | 410-650-1XXX | 1000–1999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | DUNDALK | MD |
| 2015-05-13 | 410-216-1XXX | 1000–1999 | Assigned | PEERLESS NETWORK OF MARYLAND, LLC | 568G | ANNAPOLIS | MD |
| 2015-05-12 | 410-344-4XXX | 4000–4999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | CHASE | MD |
| 2015-05-12 | 410-399-5XXX | 5000–5999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | BEL AIR | MD |
| 2015-05-12 | 410-452-2XXX | 2000–2999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | CARDIFF | MD |
| 2015-05-12 | 410-863-2XXX | 2000–2999 | Assigned | ONVOY, LLC - MD | 876D | GLENBURNIE | MD |
| 2015-05-12 | 410-863-3XXX | 3000–3999 | Assigned | ONVOY, LLC - MD | 876D | GLENBURNIE | MD |
| 2015-05-12 | 410-914-6XXX | 6000–6999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | CHURCHVL | MD |
| 2015-05-06 | 410-618-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | PERRYVILLE | MD |
| 2015-05-04 | 410-587-7XXX | 7000–7999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | ARBUTUS | MD |
| 2015-04-22 | 410-324-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | TOWSON | MD |
| 2015-04-22 | 410-324-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | TOWSON | MD |
| 2015-04-22 | 410-424-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | GLENBURNIE | MD |
| 2015-04-22 | 410-424-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | GLENBURNIE | MD |
| 2015-04-22 | 410-442-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | ELLICOTTCY | MD |
| 2015-04-22 | 410-995-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | ELLICOTTCY | MD |
| 2015-04-21 | 410-204-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | ARBUTUS | 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.