Data as of Nov 10, 2026
148.76.2.0/23
No anonymizer space · no proxy exits in 30 daysCablevision Systems Corp. · space held by 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 |
|---|---|---|---|---|---|---|
| 148. | 147,456 | OPTO | Optimum Online (OPTO) · US | Direct Allocation | May 14, 2015 | hostmaster@ |
| └ 148.76.2.0/23 | 512 | OOL-CPE-ISLPNY-148-76-2-0-1-23 | unknown | — | — | — |
Network & registry
Announced by
Covering announcement 148.76.0.0/18
- Prefix
- 148.76.0.0/18
- Announced by
- AS6128 Cablevision Systems Corp.
- Type
- Residential
- Proxy exits
- 247
- Always-on exits
- 55
- RPKI
- RPKI valid
- Netname
- OPTO
- 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 148.76.0.0/18
148.76.0.0/18
Routing history
- Pattern
- Stable
- First seen
- Mar 2026
- Current origin since
- Mar 2026 · 8 mo
- Origin networks
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 148.76.0.0/18 | AS6128 | /24 | ARIN | RPKI valid |
IRR
Route objects on 148.76.0.0/18
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS6128 | ARIN | Optimum Online | MNT-OPTO | Mar 12, 2026 |
Whois
Registration for this announcement
- Range
- 148.
74. 0. 0 - 148. 76. 63. 255 - Netname
- OPTO
- Registrant
- Optimum Online
- Organization
- Optimum Online (OPTO)
- Org address
- 111 new south RD, Hicksville, NY, 11801
- Org country
- US
- Type
- Direct Allocation
- Handle
- NET-148-74-0-0-1
- Parent
- NET-148-0-0-0-0
- Created
- May 14, 2015
- RIR
- ARIN
- Country
- US
- Delegated
- May 14, 2015
- Status
- assigned
Report abuse
Abuse contact
- nobody@
example. com - Name
- No, Contact Known
- Phone
- +1-800-555-1234
- Handle
- CKN23-ARIN