NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

2 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 857
BANDWIDTH.COM CLEC, LLC - MA 1
AHOI LLC 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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2016-07-06 857-971-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D CHARLESTN MA
2016-07-05 857-406-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BOSTON MA
2016-07-01 857-499-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 QUINCY MA
2016-06-27 857-385-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DORCHESTER MA
2016-06-22 857-760-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E WATERTOWN MA
2016-06-17 857-336-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E WINTHROP MA
2016-06-14 857-262-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-06-14 857-262-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-06-14 857-262-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-06-14 857-360-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-06-14 857-360-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-06-14 857-360-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-06-13 857-995-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E SOMERVILLE MA
2016-06-02 857-385-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DORCHESTER MA
2016-06-01 857-270-9XXX 9000–9999Assigned IP HORIZON LLC 515J CAMBRIDGE MA
2016-06-01 857-336-8XXX 8000–8999Assigned IP HORIZON LLC 515J WINTHROP MA
2016-06-01 857-361-1XXX 1000–1999Assigned IP HORIZON LLC 515J BROOKLINE MA
2016-05-31 857-293-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 EASTBOSTON MA
2016-05-27 857-262-8XXX 8000–8999Assigned IP HORIZON LLC 515J BOSTON MA
2016-05-27 857-520-8XXX 8000–8999Assigned IP HORIZON LLC 515J HYDE PARK MA
2016-05-27 857-957-8XXX 8000–8999Assigned IP HORIZON LLC 515J BOSTON MA
2016-05-26 857-800-6XXX 6000–6999Assigned METROPCS, INC. 5562 BOSTON MA
2016-05-26 857-800-7XXX 7000–7999Assigned METROPCS, INC. 5562 BOSTON MA
2016-05-26 857-990-8XXX 8000–8999Assigned METROPCS, INC. 5562 BOSTON MA
2016-05-23 857-360-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-05-23 857-360-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-05-23 857-360-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-05-23 857-360-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-05-23 857-360-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-05-23 857-360-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2016-05-20 857-971-2XXX 2000–2999Assigned TC SYSTEMS, INC. 7135 CHARLESTN MA
2016-05-18 857-270-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 CAMBRIDGE MA
2016-05-18 857-270-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 CAMBRIDGE MA
2016-05-18 857-352-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BROOKLINE MA
2016-05-18 857-971-1XXX 1000–1999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 CHARLESTN MA
2016-05-12 857-414-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BRIGHTON MA
2016-05-09 857-971-5XXX 5000–5999Assigned ONVOY, LLC - MA 892D CHARLESTN MA
2016-05-09 857-971-6XXX 6000–6999Assigned ONVOY, LLC - MA 892D CHARLESTN MA
2016-05-09 857-971-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D CHARLESTN MA
2016-04-27 857-523-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J SOMERVILLE MA
2016-04-27 857-523-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J SOMERVILLE MA
2016-04-25 857-320-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CAMBRIDGE MA
2016-04-19 857-880-0XXX 0000–0999Assigned METROPCS, INC. 5562 BOSTON MA
2016-04-19 857-880-6XXX 6000–6999Assigned METROPCS, INC. 5562 BOSTON MA
2016-04-19 857-880-7XXX 7000–7999Assigned METROPCS, INC. 5562 BOSTON MA
2016-04-19 857-880-9XXX 9000–9999Assigned METROPCS, INC. 5562 BOSTON MA
2016-04-18 857-587-2XXX 2000–2999Assigned HD CARRIER LLC 321J DORCHESTER MA
2016-04-18 857-587-3XXX 3000–3999Assigned HD CARRIER LLC 321J DORCHESTER MA
2016-04-18 857-587-4XXX 4000–4999Assigned HD CARRIER LLC 321J DORCHESTER MA
2016-04-18 857-587-5XXX 5000–5999Assigned HD CARRIER LLC 321J DORCHESTER MA

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.