Invalid DNS requests from iOS

[yubiuser]

@Emergency_trust_2639

Is anyone else seeing this behavior from iOS devices?

This is a known bug in an iOS SDK Framework, use the search function here in the forum to find out more. E.g.

Can’t add https://app-measurement.com/sdk-exp to blocking list

The query for https://app-measurement.com/ is likely caused by some application created using a faulty firebase SDK. While it doesn't make sense to query a DNS server for a URL, it's also nothing to worry about. As jfb has pointed out multiple times now, URLs will never resolve to anything with DNS, so there is also no need to block them.