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 515
WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 20
WINDSTREAM IOWA COMMUNICATIONS, INC. 13
WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 3
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2018-01-31 515-579 2XXX5XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 SLATER IA
2016-07-27 515-582 0–9 XXXall 10 · 7 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 MADRID IA
2015-06-25 515-335 0–9 XXXall 10 · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 STORY CITY IA
2015-06-25 515-934 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 NEVADA IA
2015-04-23 515-526 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 REDFIELD IA
— 515-272 0XXX2XXX5XXX7XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 SWEA CITY IA
— 515-328 0XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 RANDALL IA
— 515-367 0XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 ELKHART IA
— 515-374 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PLEASANTVL IA
— 515-382 0XXX which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 NEVADA IA
— 515-383 0XXX3XXX5XXX7XXX8XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 CAMBRIDGE IA
— 515-387 2XXX3XXX6XXX7XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 MAXWELL IA
— 515-388 0XXX2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 ROLAND IA
— 515-392 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PLEASANTVL IA
— 515-434 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 MCCALLSBG IA
— 515-436 0XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 RIPPEY IA
— 515-455 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PLEASANTVL IA
— 515-646 0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 LEDYARD IA
— 515-668 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PLEASANTVL IA
— 515-676 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 BOUTON IA
— 515-685 6XXX7XXX8XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 SLATER IA
— 515-687 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PLEASANTVL IA
— 515-688 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PLEASANTVL IA
— 515-731 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PLEASANTVL IA
— 515-733 0XXX8XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 STORY CITY IA
— 515-738 0XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 GRAND JCT IA
— 515-761 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PLEASANTVL IA
— 515-789 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 DEXTER IA
— 515-795 5XXX6XXX7XXX8XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 MADRID IA
— 515-833 0XXX4XXX5XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 REDFIELD IA
— 515-834 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 DE SOTO IA
— 515-848 4XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PLEASANTVL IA
— 515-852 0XXX2XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 DOWS IA
— 515-855 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 BUCKEYE IA
— 515-859 2XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 ALDEN IA
— 515-941 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PLEASANTVL 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.