Data as of Nov 3, 2026
65.51.173.0/24
No anonymizer space · no proxy exits in 30 daysSL Green Realty Corp · space held by Cablevision Systems Corp.
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 65.51.160.0/20 since Mar 2022 | AS54004 | Residential | Cablevision Systems Corp. | ||
| 65.51.128.0/17 since Mar 2022 | AS54004 | Residential | 41 2 always on | Cablevision Systems Corp. |
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 |
|---|---|---|---|---|---|---|
| 65.51.0.0/16 | 65,536 | CVNET-2 | Cablevision Systems Corp. (CVNT) · US | Direct Allocation | Nov 5, 2007 | [email protected] |
| └ 65.51.173.0/24 | 256 | CVNET-4133AD00 | One Madison Avenue - SL Green Realty Corp (C10567589) · US | Reassigned | Dec 21, 2023 | [email protected] via CVNET-2 |
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
Registry
Holder
- Organization
- Cablevision Systems Corp.
- Handle
- CVNT
- Range
- 65.51.0.0/16
- Registration type
- Direct Allocation
- Record created
- Nov 5, 2007
Origin network
AS400836
US
- Name
- SL Green Realty Corp
- Type
- Business
- Registered
- Jan 26, 2023
- Domain
- slgreen.com
- Industry
- Investment, Portfolio Management, Pensions and Funds
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Rotating
- First seen
- Nov 2023
- Current origin since
- Jan 2024 · 2.8 yr
- Origin networks
- 2
- Last change of origin
- Jan 2024
Recorded history
History
- Handoffs
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 65.51.173.0/24 | AS400836 | /24 | ARIN | RPKI valid |
| 65.51.160.0/20 | AS54004 | /24 | ARIN | Another network |
| 65.51.128.0/17 | AS54004 | /24 | ARIN | Another network |
| 65.51.0.0/16 | AS6128 | /24 | ARIN | Another network |
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS400836 | RADB | SL Green Realty Corp. | MAINT-AS27506 | Jan 23, 2024 |
Whois
Registration for this announcement
- Range
- 65.51.173.0/24
- Netname
- CVNET-4133AD00
- Registrant
- One Madison Avenue - SL Green Realty Corp
- Organization
- One Madison Avenue - SL Green Realty Corp (C10567589)
- Type
- Reassigned
- Handle
- NET-65-51-173-0-1
- Parent
- NET-65-51-0-0-1
- Created
- Dec 21, 2023
- RIR
- ARIN
- Country
- US
- Delegated
- Nov 5, 2007
- Status
- assigned
Report abuse
Abuse contact
- [email protected]
- Name
- OOL Hostmaster
- Phone
- +1-516-803-2400
- Handle
- OOLAB-ARIN