NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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, last 30 days — NPA 515
ONVOY, LLC - IA 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 NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2019-09-16 515-858 0–9 XXXall 10 · 5 holders which blocks → EXIANT COMMUNICATIONS LLC 114J DES MOINES IA
2019-08-29 515-466 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → ONVOY, LLC - IA 221F WHITTEMORE IA
2019-08-28 515-495 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - IA 221F PRAIRIE CY IA
2019-08-28 515-498 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - IA 221F LIVERMORE IA
2019-08-28 515-762 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - IA 221F RUNNELLS IA
2019-08-27 515-316 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - IA 221F GILMORE CY IA
2019-08-27 515-349 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - IA 221F DALLAS CTR IA
2019-08-08 515-461 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 DES MOINES IA
2019-08-08 515-553 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DES MOINES IA
2019-06-06 515-417 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 FORT DODGE IA
2019-05-13 515-516 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - IA 985E BLAIRSBURG IA
2019-04-30 515-489 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - IA 985E JEWELL IA
2019-03-27 515-706 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J DES MOINES IA
2018-12-27 515-452 0–9 XXXall 10 · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J DES MOINES IA
2018-10-08 515-732 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DES MOINES IA
2018-08-28 515-690 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → IMON COMMUNICATIONS, LLC - IA 695G INDIANOLA IA
2018-08-20 515-474 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WINTERSET IA
2018-08-15 515-815 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 AMES IA
2018-07-10 515-217 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DES MOINES IA
2018-06-20 515-654 0XXX1XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 WEBSTER CY IA
2018-06-12 515-718 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DES MOINES IA
2018-05-31 515-901 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DES MOINES IA
2018-05-30 515-587 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DES MOINES IA
2018-04-09 515-949 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - IA 985E EAGLEGROVE IA
2018-03-14 515-823 0–9 XXXall 10 · 2 holders which blocks → VONAGE AMERICA LLC 197D DES MOINES IA
2018-03-09 515-630 0–9 XXXall 10 · 2 holders which blocks → MCC TELEPHONY OF IOWA, LLC - IA 751F DES MOINES IA
2018-03-07 515-719 1XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 TITONKA IA
2018-03-07 515-744 4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 RADCLIFFE IA
2018-03-06 515-385 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 CLARION IA
2018-03-06 515-902 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 HUMBOLDT IA
2018-01-31 515-579 2XXX5XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 SLATER IA
2018-01-25 515-410 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DES MOINES IA
2017-11-22 515-214 0–9 XXXall 10 · 2 holders which blocks → MCC TELEPHONY OF IOWA, LLC - IA 751F DES MOINES IA
2017-11-08 515-620 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 AMES IA
2017-09-25 515-400 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - IA 221F DES MOINES IA
2017-09-05 515-364 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 4 holders which blocks → UNITED STATES CELLULAR - IA 6266 GOLDFIELD IA
2017-08-14 515-204 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H DES MOINES IA
2017-07-24 515-870 0XXX2XXX7XXX8XXX · 4 holders which blocks → INDEPENDENT NETWORKS, LLC 7215 SWEA CITY IA
2017-03-29 515-531 0–9 XXXall 10 · 7 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J GRANGER IA
2017-03-08 515-500 0–9 XXXall 10 · 7 holders which blocks → INTEGRATED PATH COMMUNCATIONS, LLC - IA 544H BOONE IA
2016-11-14 515-380 0–9 XXXall 10 · 2 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J DES MOINES IA
2016-09-01 515-300 0–9 XXXall 10 · 2 holders which blocks → QWEST CORPORATION 9631 DES MOINES IA
2016-08-17 515-601 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DES MOINES IA
2016-08-12 515-552 0–9 XXXall 10 · 7 holders which blocks → UNITED STATES CELLULAR - IA 6266 INDIANOLA IA
2016-07-27 515-582 0–9 XXXall 10 · 7 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 MADRID IA
2016-07-15 515-723 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DES MOINES IA
2016-06-20 515-715 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 AMES IA
2016-05-23 515-350 0–9 XXXall 10 · 4 holders which blocks → UNITED STATES CELLULAR - IA 6266 DES MOINES IA
2016-03-22 515-750 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - IA 221F DAWSON IA
2016-03-15 515-721 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DES MOINES 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.