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
2021-12-01 573-357-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 PARMA MO
2021-11-19 573-255-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F PONDER MO
2021-11-19 573-273-8XXX 8000–8999Assigned ONVOY, LLC - MO 093F ADVANCE MO
2021-11-16 573-466-5XXX 5000–5999Assigned UNITED STATES CELLULAR - MO 6275 ROLLA MO
2021-11-12 573-298-5XXX 5000–5999Assigned SKYE TELECOM LLC DBA SKYETEL 622J JEFFERSNCY MO
2021-11-10 573-602-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E ELDON MO
2021-11-09 573-600-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 HANNIBAL MO
2021-11-05 573-226-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F EMINENCE MO
2021-11-05 573-488-9XXX 9000–9999Assigned ONVOY, LLC - MO 093F ASHLAND MO
2021-11-05 573-604-6XXX 6000–6999Assigned ONVOY, LLC - MO 093F WINONA MO
2021-11-05 573-720-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H BLYTHEVL MO
2021-11-05 573-780-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 STEGNVIEVE MO
2021-11-02 573-217-2XXX 2000–2999Assigned TERRA NOVA TELECOM INC. 145J CAMPBELL MO
2021-11-02 573-281-2XXX 2000–2999Assigned TERRA NOVA TELECOM INC. 145J MALDEN MO
2021-11-02 573-930-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E HAYTI MO
2021-11-01 573-602-0XXX 0000–0999Assigned UNITED STATES CELLULAR - MO 6275 ELDON MO
2021-11-01 573-687-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 STURGEON MO
2021-11-01 573-801-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 COLUMBIA MO
2021-11-01 573-801-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 COLUMBIA MO
2021-11-01 573-801-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 COLUMBIA MO
2021-11-01 573-801-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 COLUMBIA MO
2021-10-26 573-668-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E BOURBON MO
2021-10-25 573-206-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H BEAUFORT MO
2021-10-25 573-527-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H BIRCH TREE MO
2021-10-25 573-580-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H BELLE MO
2021-10-25 573-580-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H BELLE MO
2021-10-25 573-598-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H ANNAPOLIS MO
2021-10-25 573-598-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H ANNAPOLIS MO
2021-10-25 573-697-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H BELLEVIEW MO
2021-10-25 573-697-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H BELLEVIEW MO
2021-10-25 573-720-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H BLYTHEVL MO
2021-10-25 573-720-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H BLYTHEVL MO
2021-10-21 573-708-0XXX 0000–0999Assigned ONVOY, LLC - MO 093F CAPEGIRARD MO
2021-10-21 573-708-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F CAPEGIRARD MO
2021-10-21 573-708-4XXX 4000–4999Assigned ONVOY, LLC - MO 093F CAPEGIRARD MO
2021-10-21 573-935-5XXX 5000–5999Assigned ONVOY, LLC - MO 093F DEXTER MO
2021-10-21 573-935-6XXX 6000–6999Assigned ONVOY, LLC - MO 093F DEXTER MO
2021-10-19 573-423-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H BELLEVIEW MO
2021-10-19 573-423-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H BELLEVIEW MO
2021-10-19 573-527-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H BIRCH TREE MO
2021-10-19 573-527-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H BIRCH TREE MO
2021-10-19 573-580-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H BELLE MO
2021-10-19 573-580-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H BELLE MO
2021-10-19 573-847-5XXX 5000–5999Assigned CHARTER IP ENABLED SERVICES, LLC 792K PAYNESVL MO
2021-10-19 573-994-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H ANNAPOLIS MO
2021-10-19 573-994-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H ANNAPOLIS MO
2021-10-19 573-995-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H BELLFLOWER MO
2021-10-19 573-995-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H BELLFLOWER MO
2021-10-14 573-936-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 MEXICO MO
2021-10-14 573-936-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 MEXICO 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.