This is a summary of many little useful information. Be welcome to add information if you think they will help others!
Which Host lists are included in Blokada?
Here is the link to the file that includes all links to the Host lists selectable in Blokada: https://blokada.org/api/v4/content/en/filters.txt.
If you need to check whether a domain is included in a specific list, you will find the content of the lists very easily by searching the link to the Host list in this file:)
Which information gets send if ‘Reports’ is enabled?
Blokada doesn’t send a lot of data, only: device type and manufacturer, API level, Blokada version.
Where in the phone does Blokada store data?
On iOS Blokada’s data is stored in
user defaults / blokada.
The applicationID (package name) differs depending on where you downloaded Blokada.
blokada.org -> applicationId "org.blokada.origin.alarm" F-Droid and XDA Labs -> applicationId "org.blokada.alarm" Google Play -> applicationId "org.blokada.alarm.dnschanger"
blokada.org and Huawei App Gallery -> applicationId "org.blokada.origin.alarm" Google Play Store -> applicationId "org.blokada.alarm.dnschanger" F-Droid -> applicationId "org.blokada.fem.fdroid" XDA Labs -> applicationId "org.blokada.fem.xda"
If you select request logger to log blocked / allowed / all requests. In Download / Blokada a file will appear called ‘requests.csv’.
If you want to add a Host list from local storage the file needs to be saved in Download / Blokada / filters.
In earlier versions there was a setting called with with one was able to have Blokada’s data in ‘internal or external’ storage. Careful, internal means in the internal app memory, which the user can’t access. External meant in the internal but user-accessable memory in the folder Download/ blokada.This setting is still available in the hidden mode.
Firewall feature on Android?
Not yet, but it’s planed for the future. Github requests to upvote:
How to figure out, which app accessed a specific domain?
There is a solution to this question if the user didn’t yet upgrade to Android 10:
One can use various apps to check which app requests which domain for example Net Monitor: https://f-droid.org/app/org.secuso.privacyfriendlynetmonitor.
On Github we have a feature request for implementing this function: https://github.com/blokadaorg/blokada/issues/418
How to get in touch with Host list maintainers?
Steven Black: https://github.com/StevenBlack/hosts
Jerryn70 (Goodbye Ads): https://t.me/goodbyeads and https://github.com/jerryn70/GoodbyeAds
Energized Protection: https://t.me/energizedprotection and https://github.com/EnergizedProtection/block/issues
Can’t grant VPN permission. Can’t click it.
If a user describes this behavior ask him to turn off any Screen dimmer, screen-overlay or Blue-light filter he might be using.
If that doesn’t help -> restart
If that doesn’t help -> (ask for screen dimmer etc. again and if nothing:) reinstall.
Update doesn’t show in F-Droid
Blokada’s new version is released on F-Droid but you don’t see the new update in F-Droid? Then you probably need to ‘update the repositories’ in F-Droid. To do this go to the first screen you see when opening F-Droid. There swipe to the bottom and wait until F-Droid has finished updating. Check again for updates in the bottom right corner.
The hidden mode on Android v4
The hidden mode re-enables the the display of settings that were excluded from the app for various valid reasons. Users are therefore not supposed to enable it again.
You CANNOT deactivate this mode again! You can enable it by long-tapping on the menu App settings until a Smiley appears. Restart Blokada and you will see the outdated settings.
Host lists on first install
v5 Energized Blu is preloaded. Ad blocking will work directly.
v4 Lists are not preloaded and need to be downloaded after enabling Blokada. Attention - if the user is on mobile data the list won’t be downloaded, as Ad blocking / Adblocking settings / Download on wifi is enabled by default as well.
Does it slow down your internet speed if you select more rules?
First of all, yes, the look-up costs some time, but it doesn’t cost more time the more rules (so all domains that are supposed to be blocked) are selected. The reason for this is, that Blokada stores all rules in a hash map.
The time for checking a entry consists of multiple parts:
Calculating the hash of the domain to check.
The hash function used for strings in Kotlin/Java is rather simple and has a linear runtime in proportion to the strings length.
As most domains have more or less even length this can be seen as a constant time.
Calculating the index of the bucket that should contain the entry:
This is just some really simple math. Calculating the remainder of the hash as a number divided by the number of buckets -> index of the bucket.
Checking the entries of the bucket
All entries in the bucket are checked. If there is no match the domain isn’t included. Most of the times a bucket should only contain 1 entry. If the hash function is really bad or the dataset is biased to create a lot of hash collisions a bucket could contain a lot of entries. As all entries in a bucket are organized as a linked list and are checked one by one this could affect runtime badly but for domains and the standard hash function this shouldn’t be the case.
Jio carrier service, Samsung default messaging app not working
@shibliaftab reported to us that with his carrier the default Samsung messaging app doesn’t work with Blokada enabled. Bypassng the app ‘Configuration update’, which has the package ID
com.samsung.android.providers.carrier fixes that problem.
Why is Youtube in ‘restricted mode’?
- When Youtube is in restricted mode the comments will not be loaded and also some videos are not accessible (for more information about restricted mode: https://support.google.com/youtube/answer/174084 )
- Some DNS Server (especially Adguard Family) redirect Youtube to it’s restricted mode. These DNS servers are usually family friendly DNS-servers.
- To check if this could be the problem choose another DNS server and test if it works afterwards.
Links to check the status of DNS servers
How to check which domain is included in which Host list
If you are on a Windows PC or the smartphone the easiest way to check this is to tap this link and search for the Host file you selected. Then just type ctrl+f and enter the domain you are looking for. Or use the regular search function.
On Linux you can download the file and run the command
grep -F "domainname" filename.txt. (But this is more helpful, when searching for Errors or similar in the blokada.log)
How to detect where you downloaded Blokada for Android from
In v4 check the About Blokada menu. There on top of the menu you will see
... <word> ....
In v5 check Settings / This device. There at the bottom of the menu you will see
... <word> ....
<word> can be:
full: blokada.org or Huawei App Gallery
escaped: Google Play Store
community: XDA Labs or F-Droid
xda: XDA Labs
Please only download Blokada from one of the sources mentioned in this article: Where can I download Blokada?