NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

10 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 517
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 5
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 1
LEVEL 3 COMMUNICATIONS, LLC - MI 1
INTRADO COMMUNICATIONS, LLC 1
BOOST SUBSCRIBERCO L.L.C. 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
2005-10-11 517-876-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 HOLT MI
2005-10-11 517-876-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 HOLT MI
2005-10-06 517-444-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 CHARLOTTE MI
2005-10-06 517-444-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 CHARLOTTE MI
2005-10-06 517-444-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 CHARLOTTE MI
2005-10-06 517-444-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 CHARLOTTE MI
2005-10-04 517-945-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2005-09-23 517-391-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2005-09-22 517-755-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LANSING MI
2005-09-19 517-222-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 DANSVILLE MI
2005-09-19 517-222-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 DANSVILLE MI
2005-09-12 517-833-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 MASON MI
2005-09-08 517-466-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 DANSVILLE MI
2005-09-08 517-466-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 DANSVILLE MI
2005-09-02 517-233-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 EATON RPD MI
2005-09-02 517-233-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 EATON RPD MI
2005-09-02 517-233-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 EATON RPD MI
2005-09-02 517-386-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 EATON RPD MI
2005-09-02 517-612-3XXX 3000–3999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2005-09-02 517-833-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 MASON MI
2005-09-02 517-876-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 HOLT MI
2005-08-25 517-612-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J JACKSON MI
2005-08-19 517-455-0XXX 0000–0999Assigned PAETEC ITEL, LLC 829J LANSING MI
2005-08-11 517-990-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JACKSON MI
2005-08-09 517-568-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HOMER MI
2005-08-09 517-985-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 STOCKBDG MI
2005-08-03 517-219-0XXX 0000–0999Assigned TELNET WORLDWIDE, INC. 817J FOWLERVL MI
2005-08-03 517-233-0XXX 0000–0999Assigned TELNET WORLDWIDE, INC. 817J EATON RPD MI
2005-08-03 517-431-0XXX 0000–0999Assigned TELNET WORLDWIDE, INC. 817J TIPTON MI
2005-08-03 517-456-3XXX 3000–3999Assigned TELNET WORLDWIDE, INC. 817J CLINTON MI
2005-08-03 517-458-0XXX 0000–0999Assigned TELNET WORLDWIDE, INC. 817J MORENCI MI
2005-08-03 517-522-0XXX 0000–0999Assigned TELNET WORLDWIDE, INC. 817J GRASS LAKE MI
2005-08-03 517-529-6XXX 6000–6999Assigned TELNET WORLDWIDE, INC. 817J CLARKLAKE MI
2005-08-03 517-536-2XXX 2000–2999Assigned TELNET WORLDWIDE, INC. 817J NAPOLEON MI
2005-08-03 517-626-3XXX 3000–3999Assigned TELNET WORLDWIDE, INC. 817J GRANDLEDGE MI
2005-08-03 517-641-0XXX 0000–0999Assigned TELNET WORLDWIDE, INC. 817J BATH MI
2005-08-03 517-651-4XXX 4000–4999Assigned TELNET WORLDWIDE, INC. 817J LAINGSBURG MI
2005-08-03 517-668-4XXX 4000–4999Assigned TELNET WORLDWIDE, INC. 817J DE WITT MI
2005-08-03 517-833-1XXX 1000–1999Assigned TELNET WORLDWIDE, INC. 817J MASON MI
2005-07-27 517-612-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2005-07-15 517-876-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 HOLT MI
2005-07-15 517-876-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 HOLT MI
2005-07-15 517-876-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 HOLT MI
2005-07-14 517-376-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J HOWELL MI
2005-07-07 517-203-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2005-07-07 517-442-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ADRIAN MI
2005-07-07 517-748-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
2005-07-06 517-233-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 EATON RPD MI
2005-07-06 517-233-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 EATON RPD MI
2005-07-06 517-233-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7157 EATON RPD MI

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.