NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 319
QWEST CORPORATION 99
UNITED STATES CELLULAR - IA 39
T-MOBILE USA, INC. 39
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 39
WINDSTREAM IOWA COMMUNICATIONS, INC. 37
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 NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2022-03-04 319-942 0XXX2XXX4XXX6XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J HILLSBORO IA
2022-03-04 319-996 1XXX6XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J HOUGHTON IA
2022-02-28 319-966 1XXX6XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J GRANDVIEW IA
2022-02-24 319-588 1XXX2XXX5XXX8XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ARGYLE IA
2022-02-24 319-742 2XXX6XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J DENMARK IA
2022-02-22 319-374 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ORAN IA
2022-02-18 319-675 0XXX1XXX3XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J OXFORD IA
2022-02-17 319-426 0XXX3XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J FAIRBANK IA
2022-02-17 319-663 3XXX5XXX6XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BLAIRSTOWN IA
2022-02-17 319-746 7XXX which blocks → TON80 COMMUNICATIONS, LLC 516J BRANDON IA
2022-01-27 319-405 0XXX1XXX2XXX3XXX4XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IA 985E ANAMOSA IA
2022-01-14 319-441 0XXX1XXX2XXX7XXX8XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IA 985E CENTER PT IA
2021-12-29 319-410 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → AUREON COMMUNICATIONS, LLC 444G OELWEIN IA
2021-12-14 319-407 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → UNITED STATES CELLULAR - IA 6266 WAVERLY IA
2021-12-08 319-539 3XXX which blocks → ONVOY, LLC - IA 221F RIVERSIDE IA
2021-12-02 319-388 1XXX3XXX4XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 DONNELLSON IA
2021-12-02 319-893 0–9 XXXall 10 · 5 holders which blocks → TWILIO INTERNATIONAL, INC. 506J CEDAR RPDS IA
2021-10-27 319-303 1XXX2XXX7XXX8XXX · 4 holders which blocks → AUREON COMMUNICATIONS, LLC 444G DENVER IA
2021-10-27 319-305 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 5 holders which blocks → AUREON COMMUNICATIONS, LLC 444G MT VERNON IA
2021-06-23 319-619 0XXX1XXX2XXX4XXX6XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 MONTROSE IA
2021-06-21 319-315 0–9 XXXall 10 · 6 holders which blocks → ONVOY SPECTRUM, LLC 624H ANAMOSA IA
2021-06-21 319-370 0XXX1XXX2XXX3XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H COGGON IA
2021-06-21 319-387 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H CENTRAL CY IA
2021-04-15 319-422 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - IA 221F PARKERSBG IA
2021-04-12 319-301 1XXX which blocks → MCC TELEPHONY LLC 593K SO ENGLISH IA
2021-04-12 319-933 3XXX9XXX which blocks → ONVOY, LLC - IA 221F JANESVILLE IA
2021-04-01 319-317 0–9 XXXall 10 · 5 holders which blocks → IP HORIZON LLC 515J CEDAR RPDS IA
2020-12-21 319-381 0–9 XXXall 10 · 6 holders which blocks → STRATUS NETWORKS 495J IOWA CITY IA
2020-11-25 319-380 0–9 XXXall 10 · 5 holders which blocks → STRATUS NETWORKS 495J BURLINGTON IA
2020-09-29 319-379 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J IOWA CITY IA
2020-09-28 319-386 2XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 MEDIAPOLIS IA
2020-09-21 319-324 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BRIGHTON IA
2020-08-18 319-308 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 FT MADISON IA
2020-07-23 319-304 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J CEDAR RPDS IA
2020-07-21 319-326 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IA 985E INDEPNDNCE IA
2020-06-16 319-323 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OELWEIN IA
2020-02-13 319-946 1XXX3XXX4XXX5XXX6XXX · 4 holders which blocks → FRACTEL, LLC 965H MOUNTUNION IA
2020-01-16 319-880 0–9 XXXwhole prefix which blocks → EDGETEL, LLC 179J MORNINGSUN IA
2019-12-27 319-732 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H KEOKUK IA
2019-12-17 319-348 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H WATERLOO IA
2019-12-17 319-500 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H VINTON IA
2019-06-24 319-867 0–9 XXXall 10 · 7 holders which blocks → COMMIO, LLC 939H IOWA CITY IA
2019-05-07 319-302 0–9 XXXall 10 · 5 holders which blocks → AIRUS, INC - IA 423H CENTER PT IA
2019-04-05 319-600 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H IOWA CITY IA
2019-02-22 319-900 0–9 XXXall 10 · 4 holders which blocks → TERRA NOVA TELECOM INC. 145J CEDAR RPDS IA
2019-01-28 319-666 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H CEDARFALLS IA
2018-09-07 319-582 0–9 XXXall 10 · 4 holders which blocks → AIRESPRING, INC. 996H CEDAR RPDS IA
2018-08-27 319-300 0–9 XXXall 10 · 9 holders which blocks → T-MOBILE USA, INC. 6529 WATERLOO IA
2018-07-23 319-280 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 KEOSAUQUA IA
2018-06-29 319-216 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 MARTELLE IA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.