Pcapdroid has a firewall feature which is by far the best no-root firewall app for android , I’ve used so far (also open source). Its even better than netguard or tracker control in sense that it shows you detailed level of device traffic , much like wireshark shows you on desktop does. Though its a paid feature but worth the convenience it gives you in blocking domains, ips and apps.
It does also has the “whitelist feature” which will block all connections unless you allow them.
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