Data as of Nov 4, 2026

216.57.143.0/24

No anonymizer space · no proxy exits in 30 days

Alkermes Incorporated · space held by Zayo Bandwidth

Announcement

this exact prefix

No RPKI

Announced by

Type

Business

Risk

0 / 100 · Low

Announcements

Less specific

Prefix	Origin	Type	Proxy exits	Holder	RPKI
216.57.136.0/21 since Nov 2021	AS46887	Internet provider	12 2 always on	Zayo Bandwidth
216.57.128.0/19 since Nov 2021	AS46887	Internet provider	25 5 always on	Zayo Bandwidth

The registry's network records over the announcement: those covering it, widest first, then every record inside it, under its parent.

Range	Addresses	Netname	Holder	Type	Created	Abuse contact
216.57.128.0/19	8,192	ZAYO-CCF-216-57-128-0	Zayo Bandwidth (ZAYOB) · US	Direct Allocation	Jun 7, 2000	abuse@zayo.com
└ 216.57.143.0/24	256	NET-CCF-0-216-57-143-0-24	Alkermes, Inc. (C10980568) · US	Reassigned	Oct 8, 2024	abuse@zayo.com via ZAYO-CCF-216-57-128-0

A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.

Registry

Origin network