NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

11 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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
2018-05-10 573-505-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GRAVOIS ML MO
2018-05-09 573-910-0XXX 0000–0999Assigned AIRESPRING, INC. 996H FARMINGTON MO
2018-05-07 573-212-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E ORAN MO
2018-05-07 573-361-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E ESSEX MO
2018-04-23 573-226-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E EMINENCE MO
2018-04-23 573-320-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E VAN BUREN MO
2018-04-23 573-463-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E BUNKER MO
2018-04-23 573-598-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E ANNAPOLIS MO
2018-04-23 573-671-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E LICKING MO
2018-04-20 573-302-5XXX 5000–5999Assigned CHARTER IP ENABLED SERVICES, LLC 792K LKOZKOSBCH MO
2018-04-20 573-818-1XXX 1000–1999Assigned MCC TELEPHONY LLC 593K COLUMBIA MO
2018-04-11 573-606-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 JEFFERSNCY MO
2018-03-28 573-409-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 HERMANN MO
2018-03-28 573-564-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 MONTGORYCY MO
2018-03-27 573-607-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 COLUMBIA MO
2018-03-26 573-333-3XXX 3000–3999Assigned METROPCS, INC. 5562 CARUTHRSVL MO
2018-03-19 573-616-4XXX 4000–4999Assigned MCC TELEPHONY LLC 593K JEFFERSNCY MO
2018-03-15 573-647-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 ROLLA MO
2018-03-15 573-647-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 ROLLA MO
2018-03-15 573-647-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 ROLLA MO
2018-03-09 573-508-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TAOS MO
2018-03-09 573-508-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TAOS MO
2018-03-05 573-713-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FARMINGTON MO
2018-02-15 573-345-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F CLIMAX SPG MO
2018-01-31 573-388-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 CAPEGIRARD MO
2018-01-22 573-675-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K WYATT MO
2018-01-22 573-722-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K ADVANCE MO
2018-01-22 573-733-5XXX 5000–5999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BELL CITY MO
2018-01-22 573-794-3XXX 3000–3999Assigned CHARTER IP ENABLED SERVICES, LLC 792K DELTA MO
2018-01-22 573-833-9XXX 9000–9999Assigned CHARTER IP ENABLED SERVICES, LLC 792K POCAHONTAS MO
2018-01-02 573-508-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TAOS MO
2017-12-19 573-609-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 POPLAR BLF MO
2017-12-12 573-922-4XXX 4000–4999Assigned ONVOY, LLC - MO 093F CARUTHRSVL MO
2017-12-11 573-232-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 ST ROBERT MO
2017-12-11 573-605-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PERRYVILLE MO
2017-12-06 573-430-7XXX 7000–7999Assigned ONVOY, LLC - MO 093F FLAT RIVER MO
2017-11-30 573-412-5XXX 5000–5999Assigned ONVOY, LLC - MO 093F PORTAGEVL MO
2017-11-15 573-899-9XXX 9000–9999Assigned ONVOY, LLC - MO 093F ST JAMES MO
2017-11-14 573-646-6XXX 6000–6999Assigned ONVOY, LLC - MO 093F BLAND MO
2017-11-13 573-509-2XXX 2000–2999Assigned ONVOY, LLC - MO 093F ALTEBGFRHN MO
2017-11-08 573-476-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 COLUMBIA MO
2017-11-03 573-597-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 AUXVASSE MO
2017-11-03 573-716-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 WILLIAMSBG MO
2017-11-03 573-809-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 MOKANE MO
2017-11-03 573-839-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 RHINELAND MO
2017-11-03 573-912-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 HATTON MO
2017-11-03 573-977-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 BIGSPRING MO
2017-11-02 573-506-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 TEBBETTS MO
2017-10-26 573-296-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 HALLSVILLE MO
2017-10-26 573-466-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROLLA MO

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.