nslookup knows while ping doesn't know; how is this possible?

How is this possible: % nslookup heartbeat Server: 192.168.10.1 Address: 192.168.10.1#53 Name: heartbeat.mydomain.local.lan Address: 192.168.33.6 % ping heartbeat.mydomain.local.lan ping: cannot resolve heartbeat.mydomain.local.lan: Unknown host % ping heartbeat ping: cannot resolve heartbeat: Unknown host Doesn't ping use the same source as nslookup? *** Note, that pinging internet sites work % ping www.google.com PING www.google.com (172.217.21.164): 56 data bytes 64 bytes from 172.217.21.164: icmp_seq=0 ttl=119 time=24.846 ms so don't suggest that name resolution for ping is just broken