NumberResearchRecent thousands-block assignments
1 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 301
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 |
|---|---|---|---|---|---|---|---|
| 2015-05-12 | 301-329-9XXX | 9000–9999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | ASHTON238 | MD |
| 2015-05-11 | 301-658-0XXX | 0000–0999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | ASHTON236 | MD |
| 2015-05-08 | 301-845-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | WALKERSVL | MD |
| 2015-05-06 | 301-246-5XXX | 5000–5999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | NANJEMOY | MD |
| 2015-05-06 | 301-945-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNGTNZN11 | MD |
| 2015-04-28 | 301-393-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | HAGERSTOWN | MD |
| 2015-04-24 | 301-329-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | ASHTON238 | MD |
| 2015-04-21 | 301-228-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | FREDERICK | MD |
| 2015-04-21 | 301-246-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | NANJEMOY | MD |
| 2015-04-21 | 301-732-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | FREDERICK | MD |
| 2015-04-17 | 301-269-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN2 | MD |
| 2015-04-17 | 301-857-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | CLEAR SPG | MD |
| 2015-04-17 | 301-857-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | CLEAR SPG | MD |
| 2015-04-15 | 301-771-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 6395 | WSHNGTNZN2 | MD |
| 2015-04-14 | 301-265-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | WSHNGTNZN6 | MD |
| 2015-04-02 | 301-417-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | WSNGTNZN10 | MD |
| 2015-03-19 | 301-316-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | WSHNGTNZN5 | MD |
| 2015-03-06 | 301-269-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN2 | MD |
| 2015-03-06 | 301-269-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN2 | MD |
| 2015-03-06 | 301-269-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSHNGTNZN2 | MD |
| 2015-03-05 | 301-837-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNG236Z13 | MD |
| 2015-03-03 | 301-494-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | WSNG238Z15 | MD |
| 2015-02-23 | 301-532-9XXX | 9000–9999 | Assigned | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 6855 | LAUREL238 | MD |
| 2015-02-19 | 301-274-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | HUGHESVL | MD |
| 2015-02-19 | 301-349-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | POOLESVL | MD |
| 2015-02-19 | 301-359-8XXX | 8000–8999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | 7325 | WESTERNPT | MD |
| 2015-02-19 | 301-549-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | ASHTON236 | MD |
| 2015-02-19 | 301-690-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | LEONARDTN | MD |
| 2015-02-18 | 301-900-0XXX | 0000–0999 | Assigned | ONVOY, LLC - MD | 876D | WSHNGTNZN2 | MD |
| 2015-02-18 | 301-900-9XXX | 9000–9999 | Assigned | ONVOY, LLC - MD | 876D | WSHNGTNZN2 | MD |
| 2015-02-17 | 301-304-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | WALKERSVL | MD |
| 2015-02-17 | 301-682-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | FREDERICK | MD |
| 2015-02-06 | 301-494-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | WSNG238Z15 | MD |
| 2015-02-03 | 301-264-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | MT SAVAGE | MD |
| 2015-02-03 | 301-359-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | WESTERNPT | MD |
| 2015-02-03 | 301-463-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | LONACONING | MD |
| 2015-02-03 | 301-478-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | FLINTSTONE | MD |
| 2015-02-03 | 301-798-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | DAMASCS240 | MD |
| 2015-01-28 | 301-798-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | DAMASCS240 | MD |
| 2015-01-27 | 301-799-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | KEEDYSVL | MD |
| 2015-01-27 | 301-799-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | KEEDYSVL | MD |
| 2015-01-14 | 301-241-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | HIGHFIELD | MD |
| 2015-01-14 | 301-245-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | BITTINGER | MD |
| 2015-01-14 | 301-750-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | FRIENDSVL | MD |
| 2015-01-14 | 301-882-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | NEW MARKET | MD |
| 2015-01-14 | 301-969-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | BRUNSWICK | MD |
| 2015-01-12 | 301-860-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | WSNG236Z14 | MD |
| 2015-01-05 | 301-242-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BRANDYWINE | MD |
| 2015-01-02 | 301-971-7XXX | 7000–7999 | Assigned | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 6855 | WSHNGTNZN6 | MD |
| 2014-12-05 | 301-732-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | FREDERICK | 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.