List of best mirrors for IP address 3.21.93.159, located in an unknown country.
I am very sorry, but no mirror was found. Feel free to download directly:
http://46.235.225.194/raspbian/pool/main/libu/libusrsctp/libusrsctp1_0.9.3.0+20190127-2+deb10u1_armhf.deb