Data as of Nov 7, 2026
216.255.100.0/24
No anonymizer space · no proxy exits in 30 daysMontefiore Medical Center · space held by Cablevision Systems Corp.
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 216.255.96.0/19 since May 2005 | AS6128 | Residential | 7 1 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 |
|---|---|---|---|---|---|---|
| 216.255.96.0/19 | 8,192 | CVNET-2 | Cablevision Systems Corp. (CVNT) · US | Direct Allocation | Mar 17, 2003 | abuse@ |
| └ 216.255.100.0/23 | 512 | CVNE-D8FF640 | Montefiore Medical Center (C00655018) · US | Reassigned | Aug 28, 2003 | abuse@ 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
- 216.
255. 96. 0/ 19 - Registration type
- Direct Allocation
- Record created
- Mar 17, 2003
Origin network
AS21821
US
- Name
- Montefiore Medical Center
- Type
- Business
- Registered
- Apr 3, 2017
- Domain
- montefiore.org
- Industry
- Chemical and Pharmaceutical Manufacturing
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- Oct 2006
- Current origin since
- Oct 2006 · 20 yr
- Origin networks
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 216.255.100.0/24 | AS21821 | /24 | ARIN | RPKI valid |
| 216.255.96.0/19 | AS6128 | /24 | ARIN | Another network |
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS21821 | RADB | Akamai Technologies, Inc. | MAINT-AS32787 | Nov 15, 2023 |
Whois
Registration for this announcement
- Range
- 216.
255. 100. 0/ 23 - Netname
- CVNE-D8FF640
- Registrant
- Montefiore Medical Center
- Organization
- Montefiore Medical Center (C00655018)
- Type
- Reassigned
- Handle
- NET-216-255-100-0-1
- Parent
- NET-216-255-96-0-1
- Created
- Aug 28, 2003
- RIR
- ARIN
- Country
- US
- Delegated
- Mar 17, 2003
- Status
- assigned
Report abuse
Abuse contact
- abuse@
cv. net - Name
- OOL Hostmaster
- Phone
- +1-516-803-2400
- Handle
- OOLAB-ARIN