Docs: #3288

Author: BornToBeRoot

Website/docs/application/ip-scanner.md

@@ -27,7 +27,16 @@ Example: `10.0.0.0/24; 10.0.[10-20]1`
 
 :::
 
-The button to the left of the `Scan` button determines the IP address and subnet mask of the network interface currently in use in order to scan the local subnet for active devices.
+The button to the left of the `Scan` button determines the IP address and subnet mask of the network interface
+currently in use in order to scan the local subnet for active devices.
+
+:::note
+
+The local IP address (and subnet mask) is determined by trying to route to a public IP address. If this fails (e.g. 
+no network connection), NETworkManager iterates over active network adapters and selects the first valid IPv4 address,
+with link-local addresses (`169.254.x.x`) given lower priority.
+
+:::
 
 If you right-click on a selected result, you can forward the device information to other applications (e.g. Port Scanner, Remote Desktop, etc), create a new profile with this information or execute a [custom command](#custom-commands).
 

Website/docs/changelog/next-release.md

@@ -56,6 +56,10 @@ Release date: **xx.xx.2025**
 - Settings format migrated from `XML` to `JSON`. The settings file will be automatically converted on first start after the update. [#3282](https://github.com/BornToBeRoot/NETworkManager/pull/3282)
 - Create a daily backup of the settings file before saving changes. Up to `10` backup files are kept in the `Backups` subfolder of the settings directory. [#3283](https://github.com/BornToBeRoot/NETworkManager/pull/3283)
 
+**IP Scanner**
+
+- Improved local subnet detection: If local IP cannot be determined via routing, now iterates over active network adapters and selects the first valid IPv4 address (with link-local addresses (`169.254.x.x`) given lower priority). [#3288](https://github.com/BornToBeRoot/NETworkManager/pull/3288)
+
 **DNS Lookup**
 
 - Allow hostname as server address in addition to IP address in the add/edit server dialog. [#3261](https://github.com/BornToBeRoot/NETworkManager/pull/3261)