List of best mirrors for IP address 18.118.186.156, 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/q/qtbase-opensource-src/qtbase5-dev-tools-dbgsym_5.11.3+dfsg1-1+rpi1+deb10u5_arm64.deb