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
2017-02-06 319-720-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CEDAR RPDS IA
2017-02-03 319-483-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WAVERLY IA
2017-01-20 319-371-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IA 9877 FT MADISON IA
2017-01-18 319-271-0XXX 0000–0999Assigned UNITED STATES CELLULAR - IA 6266 INDEPNDNCE IA
2016-12-29 319-834-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 IOWA CITY IA
2016-12-07 319-800-7XXX 7000–7999Assigned UNITED STATES CELLULAR - IA 6266 IOWA CITY IA
2016-12-07 319-800-8XXX 8000–8999Assigned UNITED STATES CELLULAR - IA 6266 IOWA CITY IA
2016-12-07 319-975-5XXX 5000–5999Assigned UNITED STATES CELLULAR - IA 6266 ANAMOSA IA
2016-12-07 319-975-6XXX 6000–6999Assigned UNITED STATES CELLULAR - IA 6266 ANAMOSA IA
2016-11-16 319-261-9XXX 9000–9999Assigned ONVOY, LLC - IA 221F CEDAR RPDS IA
2016-11-16 319-800-2XXX 2000–2999Assigned ONVOY, LLC - IA 221F IOWA CITY IA
2016-10-26 319-252-4XXX 4000–4999Assigned MCC TELEPHONY LLC 593K WATERLOO IA
2016-10-07 319-804-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CEDAR RPDS IA
2016-10-07 319-804-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CEDAR RPDS IA
2016-09-15 319-576-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BURLINGTON IA
2016-09-13 319-657-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IA 9877 AINSWORTH IA
2016-09-13 319-838-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ARGYLE IA
2016-09-07 319-257-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WINFIELD IA
2016-09-07 319-837-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WEST POINT IA
2016-09-06 319-254-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OLDS IA
2016-09-06 319-258-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SALEM IA
2016-09-06 319-456-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RICHLAND IA
2016-09-06 319-463-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MONTROSE IA
2016-09-06 319-614-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PACKWOOD IA
2016-09-06 319-766-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OAKVILLE IA
2016-09-06 319-836-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PRIMROSE IA
2016-09-06 319-865-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MOUNTUNION IA
2016-09-02 319-253-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HILLSBORO IA
2016-09-02 319-316-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FT MADISON IA
2016-09-02 319-469-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HOUGHTON IA
2016-09-02 319-512-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 IOWA CITY IA
2016-09-02 319-512-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 IOWA CITY IA
2016-09-02 319-670-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J KEOKUK IA
2016-09-02 319-696-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LOCKRIDGE IA
2016-09-02 319-720-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CEDAR RPDS IA
2016-09-02 319-720-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CEDAR RPDS IA
2016-09-02 319-726-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LETTS IA
2016-09-02 319-729-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J GRANDVIEW IA
2016-09-02 319-878-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FARMINGTON IA
2016-09-01 319-528-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DENMARK IA
2016-09-01 319-658-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CRAWFODSVL IA
2016-09-01 319-725-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CONESVILLE IA
2016-08-30 319-209-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BURLINGTON IA
2016-08-30 319-694-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BRIGHTON IA
2016-08-29 319-519-5XXX 5000–5999Assigned SOUTH SLOPE COOPERATIVE TELEPHONE COMPANY - IA 562E IOWA CITY IA
2016-08-29 319-519-7XXX 7000–7999Assigned SOUTH SLOPE COOPERATIVE TELEPHONE COMPANY - IA 562E IOWA CITY IA
2016-08-29 319-520-9XXX 9000–9999Assigned UNITED STATES CELLULAR - IA 6266 KEOKUK IA
2016-08-02 319-252-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WATERLOO IA
2016-08-02 319-575-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CEDARFALLS IA
2016-08-02 319-575-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CEDARFALLS 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.