NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

11 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 573
INTRADO COMMUNICATIONS, LLC 4
ONVOY, LLC - MO 2
BANDWIDTH.COM CLEC, LLC - MO 2
EXIANT COMMUNICATIONS LLC 1
E. RITTER 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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2021-02-04 573-515-4XXX 4000–4999Assigned ONVOY, LLC - MO 093F SHELBINA MO
2021-02-04 573-520-7XXX 7000–7999Assigned ONVOY, LLC - MO 093F RUSSELLVL MO
2021-02-04 573-531-4XXX 4000–4999Assigned ONVOY, LLC - MO 093F TIMBER MO
2021-02-04 573-536-3XXX 3000–3999Assigned ONVOY, LLC - MO 093F TAOS MO
2021-02-04 573-553-3XXX 3000–3999Assigned ONVOY, LLC - MO 093F WESTPHALIA MO
2021-02-04 573-584-5XXX 5000–5999Assigned ONVOY, LLC - MO 093F CENTERTOWN MO
2021-02-04 573-595-7XXX 7000–7999Assigned ONVOY, LLC - MO 093F EUGENE MO
2021-02-04 573-652-4XXX 4000–4999Assigned ONVOY, LLC - MO 093F LA GRANGE MO
2021-02-04 573-668-5XXX 5000–5999Assigned ONVOY, LLC - MO 093F BOURBON MO
2021-02-04 573-669-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F NEW HARTFD MO
2021-02-04 573-672-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F STOUTSVL MO
2021-02-04 573-674-7XXX 7000–7999Assigned ONVOY, LLC - MO 093F LICKING MO
2021-02-04 573-687-6XXX 6000–6999Assigned ONVOY, LLC - MO 093F STURGEON MO
2021-02-04 573-698-5XXX 5000–5999Assigned ONVOY, LLC - MO 093F ROCHEPORT MO
2021-02-04 573-731-8XXX 8000–8999Assigned ONVOY, LLC - MO 093F MONROECITY MO
2021-02-04 573-744-4XXX 4000–4999Assigned ONVOY, LLC - MO 093F FREEBURG MO
2021-02-04 573-763-8XXX 8000–8999Assigned ONVOY, LLC - MO 093F CHAMOIS MO
2021-02-04 573-767-4XXX 4000–4999Assigned ONVOY, LLC - MO 093F MONTICELLO MO
2021-02-04 573-791-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F EDGAR SPG MO
2021-02-04 573-791-3XXX 3000–3999Assigned ONVOY, LLC - MO 093F EDGAR SPG MO
2021-02-04 573-812-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F CUBA MO
2021-02-04 573-812-3XXX 3000–3999Assigned ONVOY, LLC - MO 093F CUBA MO
2021-02-04 573-852-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F LINN MO
2021-02-04 573-852-3XXX 3000–3999Assigned ONVOY, LLC - MO 093F LINN MO
2021-02-04 573-859-9XXX 9000–9999Assigned ONVOY, LLC - MO 093F BELLE MO
2021-02-04 573-894-4XXX 4000–4999Assigned ONVOY, LLC - MO 093F SHELBYVL MO
2021-02-04 573-909-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F NEWBLOMFLD MO
2021-02-04 573-921-3XXX 3000–3999Assigned ONVOY, LLC - MO 093F EWING MO
2021-02-04 573-928-4XXX 4000–4999Assigned ONVOY, LLC - MO 093F MONTAUK MO
2021-02-04 573-942-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F SANTA FE MO
2021-02-04 573-943-5XXX 5000–5999Assigned ONVOY, LLC - MO 093F MTSTERLING MO
2021-02-04 573-982-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F CENTRALIA MO
2021-02-04 573-982-3XXX 3000–3999Assigned ONVOY, LLC - MO 093F CENTRALIA MO
2021-02-02 573-810-8XXX 8000–8999Assigned ONVOY, LLC - MO 093F COLUMBIA MO
2021-02-02 573-812-8XXX 8000–8999Assigned ONVOY, LLC - MO 093F CUBA MO
2021-02-02 573-909-9XXX 9000–9999Assigned ONVOY, LLC - MO 093F NEWBLOMFLD MO
2021-02-01 573-516-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 FLAT RIVER MO
2021-02-01 573-516-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 FLAT RIVER MO
2021-02-01 573-933-8XXX 8000–8999Assigned UNITED STATES CELLULAR - MO 6275 CENTRALIA MO
2021-01-29 573-606-4XXX 4000–4999Assigned ONVOY, LLC - MO 093F JEFFERSNCY MO
2021-01-29 573-606-5XXX 5000–5999Assigned ONVOY, LLC - MO 093F JEFFERSNCY MO
2021-01-29 573-606-7XXX 7000–7999Assigned ONVOY, LLC - MO 093F JEFFERSNCY MO
2021-01-25 573-939-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K VANDALIA MO
2020-12-29 573-540-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 COLUMBIA MO
2020-12-22 573-264-0XXX 0000–0999Assigned TERRA NOVA TELECOM INC. 145J SCOTT CITY MO
2020-12-22 573-310-8XXX 8000–8999Assigned TERRA NOVA TELECOM INC. 145J FULTON MO
2020-12-22 573-369-3XXX 3000–3999Assigned TERRA NOVA TELECOM INC. 145J TUSCUMBIA MO
2020-12-22 573-419-0XXX 0000–0999Assigned TERRA NOVA TELECOM INC. 145J CHAFFEE MO
2020-12-22 573-688-5XXX 5000–5999Assigned TERRA NOVA TELECOM INC. 145J LILBOURN MO
2020-12-22 573-722-9XXX 9000–9999Assigned TERRA NOVA TELECOM INC. 145J ADVANCE MO

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.