Security · file snapshot 2026-09-21

Zscaler IP ranges

The Zscaler file fetched on 2026-09-21 contained 835 distinct IPv4 prefix strings and 223 IPv6 prefix strings. Inspect the source URL, recorded fields and content hash below.

IPv4
835
IPv6
223
Fetched
2026-09-21
Publisher
Zscaler
Category
Security
IPv4 prefix strings
835
IPv6 prefix strings
223
Source file
https://config.zscaler.com/api/zscaler.net/cenr/json
File format
JSON
Size
130,569 bytes
Fetched (UTC)
SHA-256
2a6e156ca4de2f6761fff976eb8bc7e489ef9a7e926ffe83f2c611fc4de9b729
Documentation
config.zscaler.com/zscaler.net/cenr

File measurement

Distinct valid prefix strings in the downloaded file. Overlapping prefixes are kept, so the count describes entries, not address-space size.
835
IPv4 prefix strings
223
IPv6 prefix strings
130,569
bytes
JSON
file format
Prefix count split: IPv4 78.9% / IPv6 21.1%. This compares entries, not address-space size.

Fields recorded from the file

Literal field names and values. A timestamp or counter is shown without assigning an update schedule to it.

The parser recorded no publisher version or timestamp field for this file.

No selected facet values were collected by this measurement.

Reproduce the count

Save the linked source as provider-file, download the Python measurement script, then run it. The result includes counts, fields and a hash; a different hash means you measured different bytes. Full counting method.
Measure a saved file
python3 ip-ranges-measure.py provider-file

ASN reference records

Holder names were read from RIPEstat on the dates below. These are separately selected reference records, not a mapping of every prefix to its origin ASN. A listed holder may differ from the provider named on this page.
Zscaler ASN records
ASNRIPEstat holderChecked
AS22616ZSCALER-SJC1 - ZSCALER, INC.2026-09-21
AS53813ZSCALER-INC - ZSCALER, INC.2026-09-21
AS62044ZSCALER-EMEA Zscaler Switzerland GmbH2026-09-21
AS53444ZSCALER-SJC - ZSCALER, INC.2026-09-21
AS62907ZSCALER-CORP - ZSCALER, INC.2026-09-21
AS32921ZSCALER-NEWYORK - ZSCALER, INC.2026-09-21
AS40384ZSCALER-GRX - ZSCALER, INC.2026-09-21
AS55242ZSCALER-ATLANTA - ZSCALER, INC.2026-09-21

Interpreting this snapshot

Where is the Zscaler IP range file?
The selected snapshot was downloaded from https://config.zscaler.com/api/zscaler.net/cenr/json. The source and documentation links on this page let you inspect the publisher's current data and scope.
What does a matching prefix establish?
A match means an address falls inside a prefix in this selected file. The measurement does not establish the identity of a requester, a device location or ownership of every address. Check the publisher’s documentation before applying access rules.
How often is this file updated?
This record measures the file fetched at 2026-09-21T19:35:32.844899+00:00. Publisher fields are reproduced as recorded, without inferring a future update schedule. Download the current source and compare hashes to check for a change.

To test an address against a saved file, follow the Python cloud CIDR matching guide. Its example parses AWS JSON; adapt the parser to this publisher's schema and preserve all matching records.

Sources

A range file lists addresses the publisher attributes to its service. Matching an address against it shows only that the address falls inside a listed prefix; it does not identify the requester or the location of a device.