Data as of Nov 8, 2026
146.203.192.0/18
No anonymizer space · no proxy exits in 30 daysMount Sinai School of Medicine
Operators, sellers and brokers
Corporate gateways
| Name | Parent | In 146.203.192.0/18 | /24s |
|---|---|---|---|
| Zscaler | 2561.6% | 1 |
Announcements
More specific
Announcements inside
| Prefix | Origin | Type | Operator | Holder | RPKI |
|---|---|---|---|---|---|
| 146.203.254.0/24 since Aug 2026 | AS22616 | Corporate gateway | Corporate gatewaysoperated by Zscaler | Mount Sinai School of Medicine |
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 |
|---|---|---|---|---|---|---|
| 146.203.0.0/16 | 65,536 | MSSMEDU-1 | Mount Sinai School of Medicine (MSSM) · US | Direct Allocation | Feb 28, 1991 | andrew. |
| └ 146.203.254.0/24 | 256 | ZSCALER-ZPA-CLIENT-VPN | Zscaler (C11674155) · US | Reassigned | Aug 7, 2026 | andrew. via MSSMEDU-1 |
A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.
Composition
The types across the prefix's announced space, by addresses.
Announced space
Address share
Announced space
Types across the prefix
16,384 addresses
| Type | Addresses | Share | Ranges | |
|---|---|---|---|---|
| Business | 16,128 | 98% | 2 | |
| Corporate gateway | 256 | 1.6% | 1 |
Network & registry
Origin network
AS11452
US
- Name
- Mount Sinai School of Medicine
- Type
- Education
- Registered
- Aug 27, 1998
- Domain
- mssm.edu
- Industry
- Hospitals and Medical Centers
- Spamhaus ASN-DROP
- not listed
Routing timeline
Who has announced this prefix
Summary
Routing history
- Pattern
- Stable
- First seen
- May 2005
- Current origin since
- May 2005 · 22 yr
- Origin networks
- 1
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS7029 not the origin | RADB | Windstream (US LEC) | MAINT-AS7029 | Nov 13, 2023 |
Whois
Registration for this announcement
- Range
- 146.
203. 0. 0/ 16 - Netname
- MSSMEDU-1
- Registrant
- Mount Sinai School of Medicine
- Organization
- Mount Sinai School of Medicine (MSSM)
- Org address
- One Gustave L. Levy Place, New York, NY, 10029-6574
- Org country
- US
- Type
- Direct Allocation
- Handle
- NET-146-203-0-0-1
- Parent
- NET-146-0-0-0-0
- Created
- Feb 28, 1991
- RIR
- ARIN
- Country
- US
- Delegated
- Feb 28, 1991
- Status
- assigned
Report abuse
Abuse contact
- andrew.
pizzimenti@ mssm. edu - Name
- Pizzimenti, Andrew
- Phone
- +1-212-241-4929
- Handle
- AP412-ARIN