NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

19 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 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
2023-06-01 557-205-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-205-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-206-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-206-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-206-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-206-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-206-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-206-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-206-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-206-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-206-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-206-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-216-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-216-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-216-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-216-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-216-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-216-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-216-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-216-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-216-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-06-01 557-216-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-05-24 557-201-0XXX 0000–0999Assigned TELNYX LLC 073H KIRKWOOD MO
2023-05-22 557-204-0XXX 0000–0999Assigned FIVE9, INC. 598J ST LOUIS MO
2023-05-19 557-203-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 MEHLVILLE MO
2023-05-15 557-201-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F KIRKWOOD MO
2023-05-15 557-201-3XXX 3000–3999Assigned ONVOY, LLC - MO 093F KIRKWOOD MO
2023-05-15 557-557-1XXX 1000–1999Assigned ONVOY, LLC - MO 093F ST LOUIS MO
2023-05-15 557-557-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F ST LOUIS MO
2023-05-15 557-557-3XXX 3000–3999Assigned ONVOY, LLC - MO 093F ST LOUIS MO
2023-05-15 557-557-4XXX 4000–4999Assigned ONVOY, LLC - MO 093F ST LOUIS MO
2023-05-15 557-557-5XXX 5000–5999Assigned ONVOY, LLC - MO 093F ST LOUIS MO
2023-05-15 557-557-7XXX 7000–7999Assigned ONVOY, LLC - MO 093F ST LOUIS MO
2023-05-15 557-557-8XXX 8000–8999Assigned ONVOY, LLC - MO 093F ST LOUIS MO
2023-05-15 557-557-9XXX 9000–9999Assigned ONVOY, LLC - MO 093F ST LOUIS MO
2023-05-10 557-222-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-05-05 557-777-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 CREVECOEUR MO
2023-05-05 557-777-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CREVECOEUR MO
2023-05-04 557-222-2XXX 2000–2999Assigned LEAP TELECOM, LLC 616J ST LOUIS MO
2023-04-14 557-201-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 KIRKWOOD MO
2023-04-14 557-201-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 KIRKWOOD MO
2023-04-14 557-999-7XXX 7000–7999Assigned WIRETAP TELECOM, LLC. 733J SAPPINGTON MO
2023-03-27 557-202-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J ST LOUIS MO
2023-01-30 557-999-8XXX 8000–8999Assigned PEERLESS NETWORK OF MISSOURI, LLC - MO 225F SAPPINGTON MO
2023-01-25 557-273-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-01-25 557-273-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-01-25 557-273-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-01-25 557-273-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-01-25 557-273-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS MO
2023-01-25 557-273-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ST LOUIS 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.