After relocating the core infrastructure to Zurich, Switzerland, a renumbering the IP addresses was necessary. This transition also impacts the NTP servers, requiring adjustments to ensure continued synchronization accuracy. The changes have already been implemented in the NTP Pool project, ensuring a seamless update for all users. Please make sure to use the nearest NTP servers to your location. The ntp03 and ntp04 servers still remains in Germany (Nuernberg).
ntp01.gyptazy.ch (stratum 1)
IPv4: 94.247.42.35
IPv6: 2a0b:7140:4:1:5054:ff:fe80:8062
Location: Zurich, Switzerland
ntp02.gyptazy.ch (stratum 1)
IPv4: 176.10.111.170
IPv6: 2a0b:7140:4:1:5054:ff:fe93:ae6a
Location: Zurich, Switzerland
ntp03.gyptazy.ch (stratum 1)
IPv4: 45.9.63.96
IPv6: 2a03:4000:45:4b::1337
Location: Nürnberg, Germany
ntp04.gyptazy.ch (stratum 1)
IPv4: 45.129.181.241
IPv6: 2a03:4000:47:1f1::1337
Location: Nürnberg, Germany
You can also find some further stats here.