Data as of Nov 3, 2026
74.89.0.0/23
No anonymizer space · no proxy exits in 30 daysCablevision Systems Corp. · space held by Optimum Online
Announcements
More specific
Announcements inside
| Prefix | Origin | Type | Holder | RPKI |
|---|---|---|---|---|
| 74.89.0.0/24 since Jan 2023 | AS6128 | Residential | Optimum Online |
Registrations in this block
The registry's network records over this block, widest first, each 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
Announced by
Covering announcement 74.88.0.0/15
- Prefix
- 74.88.0.0/15
- Announced by
- AS6128 Cablevision Systems Corp.
- Type
- Residential
- Proxy exits
- 2,342
- Always-on exits
- 513
- RPKI
- RPKI valid
- Netname
- NETBLK-OOL-8BLK
- 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
Routing timeline
Who has announced 74.88.0.0/15
74.88.0.0/15
Routing history
- Pattern
- Stable
- First seen
- Feb 2010
- Current origin since
- Feb 2010 · 17 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 |
IRR
Route objects on 74.88.0.0/15
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS6128 | ARIN | 111 new south RD | MNT-OPTO | Oct 13, 2022 |
Whois
Registration for this announcement
- Range
- 74.88.0.0 - 74.90.255.255
- Netname
- NETBLK-OOL-8BLK
- Registrant
- Optimum Online
- Organization
- Optimum Online (OPTO)
- Org address
- 111 new south RD, Hicksville, NY, 11801
- Org country
- US
- Type
- Direct Allocation
- Handle
- NET-74-88-0-0-1
- Parent
- NET-74-0-0-0-0
- Created
- Mar 4, 2009
- 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