Data as of Nov 3, 2026
74.89.0.0/24
No anonymizer space · no proxy exits in 30 daysCablevision Systems Corp. · space held by Optimum Online
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 74.88.0.0/15 since Feb 2010 | AS6128 | Residential | 2,342 513 always on | Optimum Online |
Registrations in this block
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 | [email protected] |
| └ 74.89.0.0/23 | 512 | OOL-CPE-HCVLNY-74-89-0-0-23 | Optimum Online (Cablevision Systems) (C02431958) · US | Reassigned | Feb 26, 2010 | [email protected] 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.
Network & registry
IPv4 market
Holder
- Organization
- Optimum Online
- Handle
- OPTO
- Range
- 74.88.0.0 - 74.90.255.255
- Registration type
- Direct Allocation
- Record created
- Mar 4, 2009
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
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- Oct 2018
- Current origin since
- Jan 2023 · 3.8 yr
- Origin networks
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 74.88.0.0/15 | AS6128 | /24 | ARIN | RPKI valid |
Whois
Registration for this announcement
- Range
- 74.89.0.0/23
- Netname
- OOL-CPE-HCVLNY-74-89-0-0-23
- Registrant
- Optimum Online (Cablevision Systems)
- Organization
- Optimum Online (Cablevision Systems) (C02431958)
- Type
- Reassigned
- Handle
- NET-74-89-0-0-1
- Parent
- NET-74-88-0-0-1
- Created
- Feb 26, 2010
- RIR
- ARIN
- Country
- US
- Delegated
- Mar 4, 2009
- Status
- assigned
Report abuse
Abuse contact
- [email protected]
- Name
- OOL Hostmaster
- Phone
- +1-516-803-2300
- Handle
- OH4-ORG-ARIN