$ host 2600:1f28:365:80b0:fe6c:4ae8:e422:8cd7
Host 7.d.c.8.2.2.4.e.8.e.a.4.c.6.e.f.0.b.0.8.5.6.3.0.8.2.f.1.0.0.6.2.ip6.arpa not found: 3(NXDOMAIN)