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Data as of Nov 9, 2026

146.203.254.0/24

No anonymizer space · no proxy exits in 30 days

Zscaler, Inc. · space held by Mount Sinai School of Medicine

Announcement
this exact prefix
RPKI valid
Announced by
AS22616
Type
Corporate gateway
Risk
20 / 100 · Low
Recent change
New origin Aug 2026
its first announcement on record

Operators, sellers and brokers

Corporate gateways

NameParentIn 146.203.254.0/24/24s
Zscaler
256100%
1

Announcements

Less specific

Covering announcements

PrefixOriginTypeHolderRPKI
146.203.192.0/18
since May 2005
AS11452BusinessMount 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.

RangeAddressesNetnameHolderTypeCreatedAbuse contact
146.203.0.0/1665,536MSSMEDU-1Mount Sinai School of Medicine (MSSM) · USDirect AllocationFeb 28, 1991andrew.pizzimenti@mssm.edu
└ 146.203.254.0/24256ZSCALER-ZPA-CLIENT-VPNZscaler (C11674155) · USReassignedAug 7, 2026andrew.pizzimenti@mssm.edu
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.

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
Registry

Holder

Organization
Mount Sinai School of Medicine
Handle
MSSM
Range
146.203.0.0/16
Registration type
Direct Allocation
Record created
Feb 28, 1991
Legacy
yes
Origin network

AS22616

US
Name
Zscaler, Inc.
Type
Business
Registered
May 28, 2014
Domain
zscaler.com
Website
www.zscaler.com
Industry
Service
Spamhaus ASN-DROP
not listed