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 617
BANDWIDTH.COM CLEC, LLC - MA 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
2019-10-23 617-685-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CAMBRIDGE MA
2019-10-18 617-685-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CAMBRIDGE MA
2019-10-14 617-404-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2019-10-14 617-404-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2019-10-14 617-404-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 QUINCY MA
2019-09-19 617-397-8XXX 8000–8999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
2019-09-19 617-685-1XXX 1000–1999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
2019-09-19 617-685-8XXX 8000–8999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
2019-09-19 617-685-9XXX 9000–9999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
2019-09-18 617-582-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BROOKLINE MA
2019-09-11 617-404-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D QUINCY MA
2019-09-10 617-516-3XXX 3000–3999Assigned OMNIPOINT MIAMI E LICENSE, LLC 6889 ROXBURY MA
2019-07-19 617-925-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BRIGHTON MA
2019-06-27 617-655-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2019-06-27 617-655-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2019-06-27 617-655-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2019-06-03 617-284-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D SOMERVILLE MA
2019-06-03 617-544-2XXX 2000–2999Assigned ONVOY, LLC - MA 892D EVERETT MA
2019-06-03 617-917-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D EVERETT MA
2019-06-03 617-941-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D SOMERVILLE MA
2019-05-14 617-655-6XXX 6000–6999Assigned ONVOY, LLC - MA 892D BOSTON MA
2019-05-02 617-420-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E EVERETT MA
2019-04-11 617-752-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D SO BOSTON MA
2019-04-11 617-765-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D SO BOSTON MA
2019-04-10 617-466-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J CHELSEA MA
2019-03-27 617-655-0XXX 0000–0999Assigned IP HORIZON LLC 515J BOSTON MA
2019-03-27 617-655-1XXX 1000–1999Assigned IP HORIZON LLC 515J BOSTON MA
2019-03-07 617-616-0XXX 0000–0999Assigned TELNYX LLC 073H SOMERVILLE MA
2019-02-04 617-404-2XXX 2000–2999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F QUINCY MA
2019-01-31 617-655-7XXX 7000–7999Assigned ONVOY, LLC - MA 892D BOSTON MA
2019-01-31 617-655-8XXX 8000–8999Assigned ONVOY, LLC - MA 892D BOSTON MA
2019-01-24 617-404-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D QUINCY MA
2019-01-24 617-404-9XXX 9000–9999Assigned ONVOY, LLC - MA 892D QUINCY MA
2019-01-23 617-544-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D EVERETT MA
2019-01-23 617-545-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D EVERETT MA
2018-11-26 617-485-0XXX 0000–0999Assigned ONVOY, LLC - MA 892D NEWTON MA
2018-11-26 617-485-1XXX 1000–1999Assigned ONVOY, LLC - MA 892D NEWTON MA
2018-11-15 617-485-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J NEWTON MA
2018-11-14 617-420-4XXX 4000–4999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F EVERETT MA
2018-10-01 617-404-1XXX 1000–1999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F QUINCY MA
2018-10-01 617-752-7XXX 7000–7999Assigned PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F SO BOSTON MA
2018-09-19 617-203-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E EVERETT MA
2018-09-19 617-203-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E EVERETT MA
2018-06-28 617-764-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SOMERVILLE MA
2018-05-25 617-685-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MA 990E CAMBRIDGE MA
2018-05-02 617-765-3XXX 3000–3999Assigned ONVOY, LLC - MA 892D SO BOSTON MA
2018-04-25 617-684-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SOMERVILLE MA
2018-02-19 617-404-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J QUINCY MA
2018-01-09 617-685-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CAMBRIDGE MA
2018-01-09 617-685-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CAMBRIDGE 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.