Title: VIP Platform IP ranges
Author: WordPress VIP Documentation
Published: September 17, 2020
Last modified: December 22, 2023

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 1. [Infrastructure](https://docs.wpvip.com/infrastructure/)
 2. VIP Platform IP ranges

#  VIP Platform IP ranges

In some situations, it might be necessary to allow requests from a VIP Platform 
environment that may need to interact with private resources. For example, to allow
requests from a VIP Platform site to an internal tool that is behind a firewall.

Publicly accessible IP ranges for VIP’s [origin data centers](https://docs.wpvip.com/origin-servers/)
can be found at this endpoint: [https://go-vip.net/ip-ranges.json](https://go-vip.net/ip-ranges.json)

Adding the provided IP range for a given data center will allow a site to communicate
with a restricted platform/resource.

## Precautions around IP range updates

VIP Platform IP ranges are subject to change at any time, and advance warning of
IP range updates is not provided.

For this reason, applications should be built in such a way that unexpected IP range
updates are non-breaking, either because the ranges are not required for vital site
functionality, a fallback method is provided, or some other strategy.

There are a few mechanisms to monitor updates to the published ranges:

 * The `serial` JSON field within the response contains an epoch timestamp of the
   last change.
 * The `updatedAt` JSON field within the response contains an ISO 8601 timestamp
   of the last change.
 * HTTP response of requests made with the `If-Modified-Since` header. If the last
   modification date/time is newer than the value provided in the `If-Modified-Since`
   request header, the response will be `HTTP 200 OK`. Otherwise, the response will
   be `HTTP 304 Not Modified`.

Last updated: December 22, 2023