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Data as of Nov 3, 2026

173.3.88.0/23

No anonymizer space · no proxy exits in 30 days

Cablevision Systems Corp. · space held by Optimum Online

Announcement
173.2.0.0/15
RPKI valid
Announced by
AS6128
Type
Residential
Risk
0 / 100 · Low

Registrations in this block

The registry's network records over this block, widest first, each under its parent.

RangeAddressesNetnameHolderTypeCreatedAbuse contact
173.2.0.0/15131,072CVISPOptimum Online (OPTO) · USDirect AllocationMay 12, 2008[email protected]
└ 173.3.88.0/23512OOL-CPE-NYK3NY-173-3-88-0-1-23unknown———

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
Announced by

Covering announcement 173.2.0.0/15

Prefix
173.2.0.0/15
Announced by
AS6128 Cablevision Systems Corp.
Type
Residential
Proxy exits
1,774
Always-on exits
413
RPKI
RPKI valid
Netname
CVISP
Registrant
Optimum Online
RIR
ARIN
Origin network

AS6128

US
Name
Cablevision Systems Corp.
Type
Internet provider
Domain
cablevision.com
Website
www.optimum.net
Industry
Internet Service Provider (ISP)
Spamhaus ASN-DROP
not listed