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
2018-06-29 319-218 2XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 OLIN IA
2018-06-28 319-207 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 MORLEY IA
2018-06-14 319-595 0–9 XXXall 10 · 4 holders which blocks → MCC TELEPHONY LLC 593K WATERLOO IA
2018-06-04 319-289 0–9 XXXall 10 · 6 holders which blocks → VONAGE AMERICA LLC 197D CEDAR RPDS IA
2018-03-09 319-419 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 WAVERLY IA
2018-03-08 319-839 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 MARENGO IA
2018-02-12 319-412 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2017-11-03 319-864 1XXX which blocks → KALONA COOPERATIVE TELEPHONE COMPANY - IA 957H WASHINGTON IA
2017-08-14 319-206 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H CEDAR RPDS IA
2017-08-07 319-264 0–9 XXXall 10 · 6 holders which blocks → UNITED STATES CELLULAR - IA 6266 OELWEIN IA
2017-06-29 319-259 0–9 XXXall 10 · 9 holders which blocks → TELNYX LLC 073H IOWA CITY IA
2017-06-07 319-569 0–9 XXXall 10 · 5 holders which blocks → MCC TELEPHONY LLC 593K IOWA CITY IA
2017-05-23 319-205 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J MT VERNON IA
2017-05-23 319-281 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J HUDSON IA
2017-04-19 319-251 0–9 XXXall 10 · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IA 8344 ANAMOSA IA
2017-02-24 319-249 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J CEDAR RPDS IA
2017-01-18 319-271 0–9 XXXall 10 · 5 holders which blocks → UNITED STATES CELLULAR - IA 6266 INDEPNDNCE IA
2016-07-28 319-299 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 BELLEPLAIN IA
2016-06-29 319-252 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WATERLOO IA
2016-03-15 319-727 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - IA 221F COGGON IA
2015-10-12 319-260 not yet reported which blocks → IMON COMMUNICATIONS, LLC - IA 695G CEDARFALLS IA
2015-06-25 319-220 0–9 XXXall 10 · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 CENTRAL CY IA
2015-06-25 319-245 0XXX2XXX3XXX5XXX7XXX9XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 GRUNDY CTR IA
2015-06-25 319-344 0–9 XXXall 10 · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 COLUMBSJCT IA
2015-06-25 319-552 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 MTPLEASANT IA
2015-06-25 319-722 1XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 WILLIAMSBG IA
2015-06-25 319-789 0–9 XXXall 10 · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 WASHINGTON IA
2015-06-25 319-881 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 WAPELLO IA
2015-05-14 319-589 none assigned yet which blocks → INTEGRATED PATH COMMUNCATIONS, LLC - IA 544H ALBURNETT IA
2015-05-14 319-609 none assigned yet which blocks → INTEGRATED PATH COMMUNCATIONS, LLC - IA 544H AURORA IA
2015-05-14 319-699 6XXX7XXX8XXX9XXX · 4 holders which blocks → INTEGRATED PATH COMMUNCATIONS, LLC - IA 544H ALLISON IA
2015-05-14 319-709 3XXX7XXX8XXX · 2 holders which blocks → INTEGRATED PATH COMMUNCATIONS, LLC - IA 544H WINTHROP IA
2015-05-14 319-799 9XXX which blocks → INTEGRATED PATH COMMUNCATIONS, LLC - IA 544H ATKINS IA
2015-05-12 319-349 0–9 XXXall 10 · 4 holders which blocks → INTEGRATED PATH COMMUNCATIONS, LLC - IA 544H WATERLOO IA
2015-04-09 319-320 0–9 XXXall 10 · 4 holders which blocks → INTEGRATED PATH COMMUNCATIONS, LLC - IA 544H CEDAR RPDS IA
2014-12-29 319-975 0–9 XXXall 10 · 6 holders which blocks → UNITED STATES CELLULAR - IA 6266 ANAMOSA IA
2014-11-11 319-549 1XXX2XXX8XXX9XXX · 3 holders which blocks → FARM & MERCH MUTUAL TELCO DBA KALONA COOP TEL 198H OLDS IA
2014-10-22 319-519 0–9 XXXall 10 · 7 holders which blocks → AIRUS, INC - IA 423H IOWA CITY IA
2014-08-08 319-229 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WATERLOO IA
2014-08-01 319-204 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → FARM & MERCH MUTUAL TELCO DBA KALONA COOP TEL 198H MTPLEASANT IA
2014-03-07 319-449 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - IA 221F CEDAR RPDS IA
2012-11-05 319-382 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 551G CEDAR RPDS IA
2012-09-25 319-505 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 WATERLOO IA
2012-09-10 319-559 0–9 XXXall 10 · 5 holders which blocks → UNITED STATES CELLULAR - IA 6266 WAVERLY IA
2012-07-11 319-359 0–9 XXXall 10 · 4 holders which blocks → MCC TELEPHONY LLC 593K IOWA CITY IA
2012-07-10 319-678 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9631 IOWA CITY IA
2012-02-10 319-200 not yet reported which blocks → IMON COMMUNICATIONS, LLC - IA 695G CEDAR RPDS IA
2011-11-23 319-409 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J CEDAR RPDS IA
2011-11-10 319-536 0–9 XXXall 10 · 6 holders which blocks → SHELLSBURG CABLEVISION, INC. - IA 527G CEDAR RPDS IA
2011-11-09 319-343 0–9 XXXall 10 · 3 holders which blocks → SHELLSBURG CABLEVISION, INC. - IA 527G CENTER PT 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.