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 623
BOOST SUBSCRIBERCO L.L.C. 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
2017-05-01 623-469-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2017-04-25 623-209-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2017-04-24 623-300-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PHOENIX AZ
2017-04-19 623-230-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2017-04-19 623-235-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2017-04-10 623-230-5XXX 5000–5999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2017-04-10 623-230-6XXX 6000–6999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2017-04-03 623-230-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2017-04-03 623-230-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2017-03-10 623-230-0XXX 0000–0999Assigned METROPCS, INC. 5562 PHOENIX AZ
2017-03-10 623-230-1XXX 1000–1999Assigned METROPCS, INC. 5562 PHOENIX AZ
2017-03-10 623-233-9XXX 9000–9999Assigned METROPCS, INC. 5562 PHOENIX AZ
2017-02-17 623-213-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2017-02-17 623-235-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2017-02-15 623-233-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
2017-01-20 623-233-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2017-01-20 623-233-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2017-01-12 623-233-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PHOENIX AZ
2017-01-06 623-213-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PHOENIX AZ
2016-11-22 623-232-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2016-11-22 623-232-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2016-11-22 623-232-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2016-11-22 623-232-7XXX 7000–7999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2016-11-22 623-232-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2016-11-22 623-232-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2016-11-22 623-233-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2016-11-22 623-233-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2016-11-22 623-233-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2016-11-02 623-232-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PHOENIX AZ
2016-11-02 623-232-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PHOENIX AZ
2016-10-27 623-232-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E PHOENIX AZ
2016-10-20 623-232-4XXX 4000–4999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2016-06-28 623-235-3XXX 3000–3999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2016-06-20 623-235-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2016-06-20 623-235-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2016-05-10 623-235-2XXX 2000–2999Assigned QWEST CORPORATION 9636 PHOENIX AZ
2016-04-22 623-230-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-04-22 623-230-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-04-22 623-230-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-03-23 623-213-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-03-23 623-213-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-03-23 623-213-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-03-23 623-213-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-03-23 623-213-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-03-23 623-213-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-03-23 623-213-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-03-23 623-213-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PHOENIX AZ
2016-03-23 623-226-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2016-03-23 623-226-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ
2016-03-23 623-226-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F PHOENIX AZ

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.