NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 515-387

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026

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

The ten 1,000-number thousand-blocks inside prefix 515-387 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 515 blocks

Most active assignees, all time — NPA 515
WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 6
T-MOBILE USA, INC. 2
CENTURYLINK COMMUNICATIONS, LLC 1
1
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
— 515-387-0XXX 0000–0999Reserved WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 MAXWELL IA
— 515-387-1XXX 1000–1999Reserved WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 MAXWELL IA
2012-01-31 515-387-2XXX 2000–2999Assigned WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 MAXWELL IA
2018-03-02 515-387-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 MAXWELL IA
— 515-387-4XXX 4000–4999Available MAXWELL IA
— 515-387-5XXX 5000–5999Reserved WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 MAXWELL IA
2017-02-21 515-387-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MAXWELL IA
2006-07-26 515-387-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 MAXWELL IA
— 515-387-8XXX 8000–8999Reserved WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 MAXWELL IA
— 515-387-9XXX 9000–9999Reserved WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 MAXWELL 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.