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
2004-06-22 573-521-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEW MADRID MO
2004-06-21 573-301-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JEFFERSNCY MO
2004-06-21 573-535-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 STEGNVIEVE MO
2004-05-21 573-768-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 PERRYVILLE MO
2004-05-14 573-344-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KENNETT MO
2004-05-14 573-344-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KENNETT MO
2004-05-03 573-458-6XXX 6000–6999Assigned FIDELITY CABLEVISION, LLC 3275 ROLLA MO
2004-05-03 573-578-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROLLA MO
2004-05-03 573-578-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROLLA MO
2004-04-29 573-281-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 MALDEN MO
2004-04-29 573-317-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 CAMDENTON MO
2004-04-29 573-433-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 WAYNESVL MO
2004-04-29 573-560-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 LOUISIANA MO
2004-04-29 573-561-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 FREDERCKTN MO
2004-04-29 573-567-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 MEXICO MO
2004-04-29 573-569-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 VERSAILLES MO
2004-04-29 573-575-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 CARUTHRSVL MO
2004-04-29 573-614-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 DEXTER MO
2004-04-29 573-677-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 CUBA MO
2004-04-29 573-768-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 PERRYVILLE MO
2004-04-15 573-569-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E VERSAILLES MO
2004-04-07 573-560-0XXX 0000–0999Assigned UNITED STATES CELLULAR - MO 6275 LOUISIANA MO
2004-03-18 573-714-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POPLAR BLF MO
2004-03-18 573-714-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POPLAR BLF MO
2004-03-17 573-694-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JEFFERSNCY MO
2004-03-17 573-694-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JEFFERSNCY MO
2004-03-15 573-286-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LKOZKOSBCH MO
2004-03-15 573-286-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LKOZKOSBCH MO
2004-03-15 573-286-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LKOZKOSBCH MO
2004-03-15 573-421-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DEXTER MO
2004-03-15 573-421-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DEXTER MO
2004-03-15 573-569-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 VERSAILLES MO
2004-03-10 573-586-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 FTLENARDWD MO
2004-03-09 573-259-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CUBA MO
2004-03-09 573-433-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAYNESVL MO
2004-03-09 573-433-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAYNESVL MO
2004-03-09 573-433-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAYNESVL MO
2004-03-08 573-768-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PERRYVILLE MO
2004-03-01 573-212-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 ORAN MO
2004-03-01 573-212-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 ORAN MO
2004-03-01 573-313-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 BENTON MO
2004-03-01 573-313-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 BENTON MO
2004-03-01 573-318-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 CHAFFEE MO
2004-03-01 573-318-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 CHAFFEE MO
2004-02-25 573-208-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MARBLEHILL MO
2004-02-13 573-391-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PORTAGEVL MO
2004-02-10 573-281-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MALDEN MO
2004-02-09 573-233-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHARLESTON MO
2004-02-09 573-561-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FREDERCKTN MO
2004-01-22 573-220-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FULTON 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.