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Marketing Cloud Engagement | IPv6 Not Supported in Login IP Allowlist and Impact on API Connections

Publish Date: Jul 16, 2026
Description

When you enter an IPv6-format address in the login IP allowlist on the Marketing Cloud Engagement Setup screen, a registration error occurs. This is expected behavior because the platform currently supports only IPv4 addresses. There have also been many inquiries about the impact on API communication with Marketing Cloud Engagement when Salesforce Platform IPs include IPv6 addresses following a migration to a Hyperforce environment.

Resolution

About registering an IPv6 address in the login IP allowlist

 

Q. Why can't I add an IPv6 address to the Marketing Cloud Engagement login IP allowlist, and why does an error appear?

A. Marketing Cloud Engagement currently supports only IPv4 addresses and does not support IPv6. Therefore, the platform does not accept IPv6 address registration in the login IP allowlist, and the error on input is expected behavior. At the time of writing, there are no special procedures or workarounds available to add an IPv6 address.

 

About the impact of IPv6 IPs after Hyperforce migration on Marketing Cloud Connect connections

 

Q. If Salesforce Platform (Hyperforce) IPs become IPv6, does this affect API integration via Marketing Cloud Connect?

A. There is no impact on existing functionality at the time of writing. Currently, outbound calls from Salesforce Platform (communication to external systems) use IPv6 only when the destination endpoint supports dual-stack (both IPv4 and IPv6) or IPv6-only. Because Marketing Cloud Engagement endpoints currently support IPv4 only, Salesforce Platform does not automatically attempt an IPv6 connection. There is therefore no risk of issues such as timeouts — continue using your existing IPv4 address configuration.

 

About whether to configure the login IP allowlist when using Marketing Cloud Connect

 
Q. If an organization using Marketing Cloud Connect has the login IP allowlist enabled, is it necessary to also register the IPv6-format IP addresses that Salesforce publishes?

A. Registration is not required. The Marketing Cloud Engagement login IP allowlist does not currently support IPv6 address registration. Because Marketing Cloud Engagement accepts communication over IPv4 only, as long as the correct IPv4 addresses are registered, connection errors and similar issues will not occur even if Salesforce Platform IPs include IPv6 addresses.
Knowledge Article Number

005388934

 
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