Data as of Nov 10, 2026

74.89.0.0/24

No anonymizer space · no proxy exits in 30 days

Cablevision Systems Corp. · space held by Optimum Online

Announcement

this exact prefix

RPKI valid

Announced by

Type

Residential

Risk

0 / 100 · Low

Announcements

Less specific

Prefix	Origin	Type	Proxy exits	Holder	RPKI
74.88.0.0/15 since Feb 2010	AS6128	Residential	2,477 557 always on	Optimum Online

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
74.88.0.0 - 74.90.255.255	196,608	NETBLK-OOL-8BLK	Optimum Online (OPTO) · US	Direct Allocation	Mar 4, 2009	hostmaster@alticeusa.com
└ 74.89.0.0/23	512	OOL-CPE-HCVLNY-74-89-0-0-23	Optimum Online (Cablevision Systems) (C02431958) · US	Reassigned	Feb 26, 2010	hostmaster@alticeusa.com via NETBLK-OOL-8BLK

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

Routing timeline

Summary