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
2009-11-18 573-466-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 ROLLA MO
2009-11-11 573-712-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POPLAR BLF MO
2009-11-11 573-723-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LKOZKOSBCH MO
2009-10-26 573-231-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HANNIBAL MO
2009-10-26 573-693-9XXX 9000–9999Assigned CHARTER IP ENABLED SERVICES, LLC 792K LKOZKOSBCH MO
2009-10-14 573-990-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 MALDEN MO
2009-09-23 573-519-4XXX 4000–4999Assigned SOUTHWESTERN BELL 9533 CAPEGIRARD MO
2009-09-16 573-705-5XXX 5000–5999Assigned METROPCS, INC. 5562 FARMINGTON MO
2009-09-15 573-629-5XXX 5000–5999Assigned UNITED STATES CELLULAR - MO 6275 HANNIBAL MO
2009-09-08 573-210-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 POTOSI MO
2009-08-25 573-846-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PERRYVILLE MO
2009-08-18 573-789-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 VERSAILLES MO
2009-08-17 573-777-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 COLUMBIA MO
2009-08-03 573-256-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBIA MO
2009-07-27 573-214-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 COLUMBIA MO
2009-07-22 573-208-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MARBLEHILL MO
2009-07-13 573-298-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 JEFFERSNCY MO
2009-06-25 573-723-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 LKOZKOSBCH MO
2009-06-25 573-772-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 POPLAR BLF MO
2009-06-15 573-258-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SIKESTON MO
2009-05-14 573-345-6XXX 6000–6999Assigned AURORA COMMUNICATIONS, INC. - MO 506E CLIMAX SPG MO
2009-05-13 573-337-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 ST ROBERT MO
2009-05-13 573-355-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 COLUMBIA MO
2009-05-05 573-629-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 HANNIBAL MO
2009-05-04 573-645-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JEFFERSNCY MO
2009-04-30 573-415-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 JEFFERSNCY MO
2009-04-23 573-545-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 BENTON MO
2009-04-20 573-253-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MEXICO MO
2009-04-15 573-427-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHARLESTON MO
2009-04-13 573-529-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 COLUMBIA MO
2009-04-13 573-529-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 COLUMBIA MO
2009-04-09 573-789-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 VERSAILLES MO
2009-03-17 573-200-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CAPEGIRARD MO
2009-03-13 573-693-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LKOZKOSBCH MO
2009-03-09 573-772-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 POPLAR BLF MO
2009-02-26 573-315-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 FLAT RIVER MO
2009-02-26 573-466-9XXX 9000–9999Assigned UNITED STATES CELLULAR - MO 6275 ROLLA MO
2009-02-16 573-559-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KENNETT MO
2009-02-16 573-944-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FREDERCKTN MO
2009-02-12 573-452-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 FTLENARDWD MO
2009-02-09 573-479-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HAYTI MO
2009-02-03 573-416-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 FULTON MO
2009-01-13 573-451-3XXX 3000–3999Assigned FIDELITY CABLEVISION, LLC 3275 ST ROBERT MO
2009-01-13 573-777-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 COLUMBIA MO
2009-01-07 573-343-1XXX 1000–1999Assigned SOUTHWESTERN BELL 9533 PUXICO MO
2009-01-07 573-355-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 COLUMBIA MO
2009-01-06 573-569-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 VERSAILLES MO
2009-01-05 573-271-7XXX 7000–7999Assigned ONVOY, LLC - MO 093F CAPEGIRARD MO
2008-12-29 573-453-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SALEM MO
2008-12-19 573-207-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E GRAVOIS ML 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.