List of best mirrors for IP address 3.143.7.112, located in an unknown country.
I am very sorry, but no mirror was found. Feel free to download directly:
http://mirrordirector-mb.raspbian.org/multiarch/pool/main/o/opencv/libopencv-dnn4.2-dbgsym_4.2.0+dfsg-6+b3_arm64.deb