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Data as of Nov 7, 2026

104.148.188.0/23

No anonymizer space · no proxy exits in 30 days

Cablevision Systems Corp. · space held by Optimum Online

Announcement
104.148.128.0/17
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
104.148.128.0/1732,768NETBLK-OOL-12BLKOptimum Online (OPTO) · USDirect AllocationJul 15, 2014hostmaster@alticeusa.com
└ 104.148.188.0/23512OOL-CPE-FRHDNJ-104-148-188-0-23unknown———

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
Announced by

Covering announcement 104.148.128.0/17

Prefix
104.148.128.0/17
Announced by
AS6128 Cablevision Systems Corp.
Type
Residential
Proxy exits
330
Always-on exits
103
RPKI
RPKI valid
Netname
NETBLK-OOL-12BLK
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