What are the IPv4 and IPv6 addresses of the name servers?

As follows you will find an overview of the current nameserver locations:

ns.inwx.com / ns.domrobot.com
IPv4 address:
IPv6-address: 2001:67c:1bc::104
Location: Anycast DNS ¹

ns2.inwx.com / ns.domrobot.net
IPv4 address:
IPv6-address: 2001:67c:10b8::104
Location: Anycast DNS ²

ns3.inwx.eu / ns.domrobot.org
IPv4 address:
IPv6 address: 2a02:d500::53
Location: Berlin, DE

Locations Anycast DNS ¹
Amsterdam, Atlanta, Chicago, Dallas, Dublin, Frankfurt, Hongkong, Johannesburg, London, Los Angeles, Madrid, Miami, Moscow, Mumbai, New York, Paris, Reykjavik,  Salzburg, Sao Paulo, Seattle, Singapore, Stockholm, Sydney, Tokyo, Warsaw, Vienna, Zurich

Locations Anycast DNS ²
Amsterdam, Athens, Chicago, Dallas, Dubai, Frankfurt, Genf, Hong Kong, Johannesburg, Ljubljana, London, Miami, Reston, San Jose, Sao Paulo, Seattle, Seoul, Sydney, Toronto, Vienna