List of best mirrors for IP address 3.148.104.103, located in an unknown country.
I am very sorry, but no mirror was found. Feel free to download directly:
http://mirrordirector-mb.raspbian.org/raspbian/pool/main/n/ntpsec/ntp_4.2.8p15+dfsg-2~1.2.3+dfsg1-3_all.deb