NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

6 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 313
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 4
OPENTACT INC. 1
INTRADO COMMUNICATIONS, 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
2017-09-18 313-509-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2017-09-18 313-509-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2017-09-01 313-314-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2017-08-18 313-462-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J DETROITZN1 MI
2017-08-15 313-379-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2017-08-15 313-379-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2017-08-15 313-379-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2017-08-15 313-379-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2017-08-15 313-379-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2017-07-27 313-633-7XXX 7000–7999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L DETROITZN6 MI
2017-07-18 313-395-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2017-07-18 313-509-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2017-07-05 313-286-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2017-07-05 313-635-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2017-07-05 313-942-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2017-06-30 313-284-9XXX 9000–9999Assigned ONVOY, LLCV - MI 543C DETROITZN2 MI
2017-06-30 313-314-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2017-06-30 313-426-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN1 MI
2017-06-30 313-635-7XXX 7000–7999Assigned ONVOY, LLCV - MI 543C DETROITZN4 MI
2017-06-30 313-992-4XXX 4000–4999Assigned ONVOY, LLCV - MI 543C DETROITZN5 MI
2017-06-29 313-379-0XXX 0000–0999Assigned GRID 4 COMMUNICATIONS, INC. - MI 9714 DETROITZN1 MI
2017-06-21 313-462-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J DETROITZN1 MI
2017-06-16 313-992-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2017-06-16 313-992-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
2017-06-14 313-426-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2017-06-12 313-426-5XXX 5000–5999Assigned MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
2017-06-12 313-426-6XXX 6000–6999Assigned MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
2017-06-09 313-426-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2017-06-09 313-426-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2017-06-09 313-426-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2017-05-01 313-314-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2017-03-01 313-426-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN1 MI
2017-02-24 313-379-7XXX 7000–7999Assigned CLEAR RATE COMMUNICATIONS, LLC 046L DETROITZN1 MI
2017-01-31 313-426-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2017-01-18 313-426-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2017-01-11 313-284-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2017-01-11 313-314-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2017-01-11 313-314-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN3 MI
2017-01-11 313-356-8XXX 8000–8999Assigned ONVOY, LLCV - MI 543C DETROITZN3 MI
2017-01-11 313-395-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2017-01-11 313-636-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2017-01-11 313-636-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2017-01-11 313-636-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN4 MI
2017-01-11 313-752-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2017-01-11 313-752-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2017-01-11 313-752-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN1 MI
2017-01-11 313-992-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2017-01-11 313-992-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2016-12-07 313-752-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2016-11-22 313-332-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J DETROITZN2 MI

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.