NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

19 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 557
NEW CINGULAR WIRELESS PCS, LLC - IL 10
ONVOY, LLC - MO 9
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
2024-02-29 557-209-0XXX 0000–0999Assigned ONVOY, LLC - MO 093F KIRKWOOD MO
2024-02-29 557-209-1XXX 1000–1999Assigned ONVOY, LLC - MO 093F KIRKWOOD MO
2024-02-29 557-209-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F KIRKWOOD MO
2024-02-20 557-220-0XXX 0000–0999Assigned ONVOY, LLC - MO 093F CREVECOEUR MO
2024-02-14 557-215-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F ST LOUIS MO
2024-02-08 557-202-6XXX 6000–6999Assigned ONVOY, LLC - MO 093F ST LOUIS MO
2024-02-08 557-202-7XXX 7000–7999Assigned ONVOY, LLC - MO 093F ST LOUIS MO
2024-01-29 557-212-7XXX 7000–7999Assigned ONVOY, LLC - MO 093F MEHLVILLE MO
2024-01-23 557-212-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MEHLVILLE MO
2024-01-23 557-220-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CREVECOEUR MO
2023-12-28 557-214-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST LOUIS MO
2023-12-28 557-214-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST LOUIS MO
2023-12-28 557-214-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST LOUIS MO
2023-12-28 557-214-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST LOUIS MO
2023-12-28 557-215-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST LOUIS MO
2023-12-28 557-215-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST LOUIS MO
2023-12-22 557-218-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
2023-12-22 557-218-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
2023-12-15 557-224-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 CREVECOEUR MO
2023-12-15 557-224-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 CREVECOEUR MO
2023-12-15 557-224-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 CREVECOEUR MO
2023-12-15 557-224-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 CREVECOEUR MO
2023-12-15 557-224-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 CREVECOEUR MO
2023-12-15 557-224-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 CREVECOEUR MO
2023-12-15 557-224-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 CREVECOEUR MO
2023-12-15 557-224-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 CREVECOEUR MO
2023-12-15 557-224-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 CREVECOEUR MO
2023-12-15 557-224-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 CREVECOEUR MO
2023-11-28 557-210-8XXX 8000–8999Assigned NUSO, LLC 732J LADUE MO
2023-11-28 557-210-9XXX 9000–9999Assigned NUSO, LLC 732J LADUE MO
2023-11-15 557-215-1XXX 1000–1999Assigned CALLWORKS CORPORATION 475J ST LOUIS MO
2023-11-15 557-217-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SAPPINGTON MO
2023-11-13 557-210-7XXX 7000–7999Assigned IP HORIZON LLC 515J LADUE MO
2023-11-13 557-212-4XXX 4000–4999Assigned IP HORIZON LLC 515J MEHLVILLE MO
2023-11-13 557-212-5XXX 5000–5999Assigned IP HORIZON LLC 515J MEHLVILLE MO
2023-11-13 557-213-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST LOUIS MO
2023-11-13 557-214-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST LOUIS MO
2023-11-13 557-214-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST LOUIS MO
2023-11-13 557-214-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST LOUIS MO
2023-10-26 557-208-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H LADUE MO
2023-10-26 557-208-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H LADUE MO
2023-10-26 557-208-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H LADUE MO
2023-10-26 557-208-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H LADUE MO
2023-10-26 557-210-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H LADUE MO
2023-10-05 557-208-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
2023-10-05 557-208-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
2023-09-27 557-201-5XXX 5000–5999Assigned ONVOY, LLC - MO 093F KIRKWOOD MO
2023-09-27 557-201-9XXX 9000–9999Assigned ONVOY, LLC - MO 093F KIRKWOOD MO
2023-09-25 557-202-0XXX 0000–0999Assigned ONVOY, LLC - MO 093F ST LOUIS MO
2023-09-07 557-208-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F LADUE MO

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.