NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

12 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 319
ONVOY, LLC - IA 6
T-MOBILE USA, INC. 2
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 2
BANDWIDTH.COM CLEC, LLC - IA 2
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
2018-08-29 319-251-0XXX 0000–0999Assigned UNITED STATES CELLULAR - IA 6266 ANAMOSA IA
2018-08-28 319-300-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 WATERLOO IA
2018-08-24 319-289-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CEDAR RPDS IA
2018-08-23 319-289-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2018-08-23 319-289-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2018-08-23 319-289-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2018-08-23 319-289-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2018-08-23 319-289-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2018-08-23 319-412-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2018-08-23 319-412-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2018-08-23 319-412-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2018-08-23 319-595-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 WATERLOO IA
2018-08-23 319-595-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 WATERLOO IA
2018-08-23 319-595-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 WATERLOO IA
2018-08-23 319-595-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 WATERLOO IA
2018-08-15 319-569-4XXX 4000–4999Assigned MCC TELEPHONY LLC 593K IOWA CITY IA
2018-07-27 319-449-9XXX 9000–9999Assigned MCC TELEPHONY LLC 593K CEDAR RPDS IA
2018-07-27 319-694-8XXX 8000–8999Assigned METROPCS, INC. 5562 BRIGHTON IA
2018-07-27 319-878-8XXX 8000–8999Assigned METROPCS, INC. 5562 FARMINGTON IA
2018-07-24 319-280-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 KEOSAUQUA IA
2018-07-24 319-280-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 KEOSAUQUA IA
2018-07-24 319-280-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 KEOSAUQUA IA
2018-07-19 319-677-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 KEOSAUQUA IA
2018-07-19 319-677-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 KEOSAUQUA IA
2018-07-19 319-677-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 KEOSAUQUA IA
2018-07-19 319-677-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 KEOSAUQUA IA
2018-07-18 319-495-5XXX 5000–5999Assigned METROPCS, INC. 5562 LAPORTE CY IA
2018-07-18 319-674-4XXX 4000–4999Assigned METROPCS, INC. 5562 WELLMAN IA
2018-07-18 319-709-7XXX 7000–7999Assigned METROPCS, INC. 5562 WINTHROP IA
2018-07-18 319-823-3XXX 3000–3999Assigned METROPCS, INC. 5562 GRUNDY CTR IA
2018-07-18 319-839-3XXX 3000–3999Assigned METROPCS, INC. 5562 MARENGO IA
2018-07-18 319-844-3XXX 3000–3999Assigned METROPCS, INC. 5562 MONTICELLO IA
2018-07-05 319-569-3XXX 3000–3999Assigned AIRUS, INC - IA 423H IOWA CITY IA
2018-06-29 319-207-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IA 9877 MORLEY IA
2018-06-29 319-216-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IA 9877 MARTELLE IA
2018-06-29 319-218-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IA 9877 OLIN IA
2018-06-28 319-677-3XXX 3000–3999Assigned METROPCS, INC. 5562 KEOSAUQUA IA
2018-06-28 319-722-7XXX 7000–7999Assigned METROPCS, INC. 5562 WILLIAMSBG IA
2018-06-20 319-595-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 WATERLOO IA
2018-06-20 319-595-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 WATERLOO IA
2018-06-18 319-204-2XXX 2000–2999Assigned METROPCS, INC. 5562 MTPLEASANT IA
2018-06-18 319-460-7XXX 7000–7999Assigned METROPCS, INC. 5562 WASHINGTON IA
2018-06-15 319-205-9XXX 9000–9999Assigned TELNYX LLC 073H MT VERNON IA
2018-06-15 319-251-9XXX 9000–9999Assigned TELNYX LLC 073H ANAMOSA IA
2018-06-15 319-281-2XXX 2000–2999Assigned TELNYX LLC 073H HUDSON IA
2018-06-15 319-318-4XXX 4000–4999Assigned TELNYX LLC 073H VINTON IA
2018-06-15 319-406-4XXX 4000–4999Assigned TELNYX LLC 073H DENVER IA
2018-06-15 319-419-1XXX 1000–1999Assigned TELNYX LLC 073H WAVERLY IA
2018-06-15 319-465-0XXX 0000–0999Assigned TELNYX LLC 073H MONTICELLO IA
2018-06-15 319-595-1XXX 1000–1999Assigned MCC TELEPHONY LLC 593K WATERLOO IA

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.