NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

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
ONVOY, LLC - MD 1
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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2014-09-02 301-844-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN3 MD
2014-09-02 301-844-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN3 MD
2014-08-22 301-549-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2014-08-22 301-549-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2014-08-22 301-549-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2014-08-22 301-658-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
2014-08-22 301-978-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN10 MD
2014-08-19 301-691-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 POOLESVL MD
2014-08-11 301-882-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F NEW MARKET MD
2014-08-07 301-329-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D ASHTON238 MD
2014-08-07 301-969-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J BRUNSWICK MD
2014-08-06 301-327-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNG238Z15 MD
2014-08-06 301-771-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D WSHNGTNZN2 MD
2014-08-05 301-231-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D WSNGTNZN11 MD
2014-08-04 301-851-0XXX 0000–0999Assigned ONVOY, LLC - MD 876D WSHNGTNZN4 MD
2014-08-04 301-905-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D WSHNGTNZN3 MD
2014-07-30 301-798-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F DAMASCS240 MD
2014-07-10 301-250-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GAITHERSBG MD
2014-07-10 301-784-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CUMBERLAND MD
2014-06-27 301-844-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WSHNGTNZN3 MD
2014-06-24 301-708-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2014-06-24 301-708-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 MD
2014-06-13 301-241-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F HIGHFIELD MD
2014-06-13 301-245-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F BITTINGER MD
2014-06-13 301-304-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WALKERSVL MD
2014-06-13 301-453-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F KITZMILLER MD
2014-06-10 301-994-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 LXTNPKGRML MD
2014-05-28 301-844-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2014-05-27 301-242-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BRANDYWINE MD
2014-05-27 301-265-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WSHNGTNZN6 MD
2014-05-27 301-372-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WSNGTNZN16 MD
2014-05-27 301-438-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WSNGTNZN12 MD
2014-05-27 301-798-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J DAMASCS240 MD
2014-05-27 301-804-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ASHTON236 MD
2014-05-23 301-494-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WSNG238Z15 MD
2014-05-14 301-246-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J NANJEMOY MD
2014-05-14 301-329-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ASHTON238 MD
2014-05-14 301-690-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LEONARDTN MD
2014-05-14 301-691-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J POOLESVL MD
2014-05-12 301-321-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J WSNGTNZN11 MD
2014-05-12 301-931-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J WSNG236Z13 MD
2014-05-07 301-388-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNGTNZN12 MD
2014-05-07 301-966-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNGTNZN12 MD
2014-05-06 301-338-9XXX 9000–9999Assigned SHENTEL COMMUNICATIONS, LLC. - MD 836G CUMBERLAND MD
2014-05-02 301-232-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ASHTON236 MD
2014-05-02 301-284-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WSNGTNZN10 MD
2014-05-02 301-338-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CUMBERLAND MD
2014-04-18 301-798-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F DAMASCS240 MD
2014-04-08 301-546-0XXX 0000–0999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
2014-04-08 301-546-1XXX 1000–1999Assigned VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 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.