Hello Swinog,

The TLD zones .ch/.li make use of the RcodeZero Anycast DNS service of nic.at since a few weeks (The nameserver letters d.nic.ch/d.nic.li to be precise). Nic.at has now added an anycast node at SwissIX. In order to get the best possible RTT and increased resiliency against potential DDOS attacks on the DNS infrastructure we encourage network operators peering at SwissIX without using the route servers to get in contact with nic.at for direct peering:

AS1921, Peering @ SwissIX https://peeringdb.com/ix/60 IP addresses: 91.206.52.164, 2001:7f8:24::a4 Contact: ops@nic.at

The RcodeZero Anycast DNS node at this location provides DNS services for multiple other TLDs.

Best regards, Daniel -- SWITCH DNS Operations