NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

70 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 667
NEW CINGULAR WIRELESS PCS, LLC - DC 38
ONVOY, LLC - MD 18
BANDWIDTH.COM CLEC, LLC - MD 6
METROPCS, INC. 2
INTRADO COMMUNICATIONS, LLC 2
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
2021-08-18 667-325-1XXX 1000–1999Assigned COMMIO, LLC 939H GLENBURNIE MD
2021-08-17 667-910-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2021-08-16 667-299-8XXX 8000–8999Assigned COMMIO, LLC 939H ANNAPOLIS MD
2021-08-11 667-318-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H COCKEYSVL MD
2021-08-11 667-324-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H RANDALLSTN MD
2021-08-11 667-657-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H CHASE MD
2021-08-10 667-646-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ANNAPOLIS MD
2021-07-29 667-310-4XXX 4000–4999Assigned COMMIO, LLC 939H PARKVILLE MD
2021-07-29 667-310-5XXX 5000–5999Assigned COMMIO, LLC 939H PARKVILLE MD
2021-07-29 667-310-6XXX 6000–6999Assigned COMMIO, LLC 939H PARKVILLE MD
2021-07-29 667-310-7XXX 7000–7999Assigned COMMIO, LLC 939H PARKVILLE MD
2021-07-29 667-310-8XXX 8000–8999Assigned COMMIO, LLC 939H PARKVILLE MD
2021-07-29 667-343-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 CAMBRIDGE MD
2021-07-29 667-343-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 CAMBRIDGE MD
2021-07-29 667-343-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 CAMBRIDGE MD
2021-07-29 667-343-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 CAMBRIDGE MD
2021-07-29 667-343-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 CAMBRIDGE MD
2021-07-29 667-343-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 CAMBRIDGE MD
2021-07-29 667-343-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 CAMBRIDGE MD
2021-07-29 667-343-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 CAMBRIDGE MD
2021-07-29 667-343-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 CAMBRIDGE MD
2021-07-29 667-343-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 CAMBRIDGE MD
2021-07-29 667-910-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D BALTIMORE MD
2021-07-27 667-656-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F EDGEWOOD MD
2021-07-27 667-656-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F EDGEWOOD MD
2021-07-26 667-266-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2021-07-20 667-337-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CENTREVL MD
2021-07-20 667-657-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CHASE MD
2021-07-19 667-274-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ELKRIDGE MD
2021-07-15 667-331-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 TOWSON MD
2021-07-14 667-328-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ESSEX MD
2021-07-14 667-328-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ESSEX MD
2021-07-13 667-331-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2021-07-08 667-275-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2021-07-08 667-275-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2021-07-08 667-308-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2021-07-08 667-331-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2021-07-08 667-331-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2021-07-08 667-331-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2021-07-08 667-331-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2021-07-08 667-331-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2021-07-01 667-318-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 COCKEYSVL MD
2021-07-01 667-356-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SEVERN MD
2021-07-01 667-356-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SEVERN MD
2021-06-30 667-304-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ESSEX MD
2021-06-30 667-310-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 PARKVILLE MD
2021-06-30 667-657-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CHASE MD
2021-06-30 667-895-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BALTIMORE MD
2021-06-29 667-325-3XXX 3000–3999Assigned TON80 COMMUNICATIONS, LLC 516J GLENBURNIE MD
2021-06-29 667-345-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 CATONSVL 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.