Microsoft Edge: Changes to local IP address detection for proxy auto-config (PAC) scripts

Vendor: Microsoft
Product: Microsoft Edge
Type: Availability
Announcement date: 2026-08-05
Effective date: Date not published
Impact: Affected

In brief

What the source says

Microsoft Edge is changing how it selects the local network address reported to proxy auto-config (PAC) scripts and is adding administrator control over it. The default IPv4 and IPv6 probe destinations now match Chromium’s defaults. Administrators can override these defaults using the PacMyIpAddressIPv4ProbeAddress and PacMyIpAddressIPv6ProbeAddress policies when required by their network routing. GA date: September CY2026 In development General Availability Worldwide (Standard Multi-Tenant) Microsoft Edge Web

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Who is affected: The audience described by the Microsoft update is represented by: Microsoft Edge: Changes to local IP address detection for proxy auto-config (PAC) scripts Microsoft Edge is changing how it selects the local network address reported to proxy auto-config (PAC) scripts and is adding administrator control over it. The default IPv4 and IPv6 probe destinations now match Chromium’s defaults. Administrators can override these defaults using the PacMyIpAddressIPv4ProbeAddress and PacMyIpAddressIPv6ProbeAddress policies when required by their network routing. GA date:

Why it matters: The change matters because the official source describes: Microsoft Edge: Changes to local IP address detection for proxy auto-config (PAC) scripts Microsoft Edge is changing how it selects the local network address reported to proxy auto-config (PAC) scripts and is adding administrator control over it. The default IPv4 and IPv6 probe destinations now match Chromium’s defaults. Administrators can override these defaults using the PacMyIpAddressIPv4ProbeAddress and PacMyIpAddressIPv6ProbeAddress policies when required by their network routing. GA date:

Urgency: Monitor

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Raw capture
2026-08-29T09:22:49.319599+00:00
Event
Microsoft Edge: Changes to local IP address detection for proxy auto-config (PAC) scripts Microsoft Edge is changing how it selects the local network address reported to proxy auto-config (PAC) scripts and is adding administrator control over it. The default IPv4 and IPv6 probe destinations now match Chromium’s defaults. Administrators can override these defaults using the PacMyIpAddressIPv4ProbeAddress and PacMyIpAddressIPv6ProbeAddress policies when required by their network routing. GA date: September CY2026 In development General Availability Worldwide (Standard Multi-Tenant) Microsoft Edge Web
source
Product Microsoft Edge
Microsoft Edge: Changes to local IP address detection for proxy auto-config (PAC) scripts Microsoft Edge is changing how it selects the local network address reported to proxy auto-config (PAC) scripts and is adding administrator control over it. The default IPv4 and IPv6 probe destinations now match Chromium’s defaults. Administrators can override these defaults using the PacMyIpAddressIPv4ProbeAddress and PacMyIpAddressIPv6ProbeAddress policies when required by their network routing. GA date: September CY2026 In development General Availability Worldwide (Standard Multi-Tenant) Microsoft Edge Web
source
Insight a salesperson
Microsoft Edge: Changes to local IP address detection for proxy auto-config (PAC) scripts Microsoft Edge is changing how it selects the local network address reported to proxy auto-config (PAC) scripts and is adding administrator control over it. The default IPv4 and IPv6 probe destinations now match Chromium’s defaults. Administrators can override these defaults using the PacMyIpAddressIPv4ProbeAddress and PacMyIpAddressIPv6ProbeAddress policies when required by their network routing. GA date: September CY2026 In development General Availability Worldwide (Standard Multi-Tenant) Microsoft Edge Web
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