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Interesting example systems

System with TWO cannonical names with at least one CNAME pointing at each:
APPORA-RH6

select count(distinct nn.name), s.name 
from node_aliases na, network_nodes nn, systems s
where na.type_id=185
and na.node_id=nn.id
and nn.system_id=s.id
group by s.name having count(distinct nn.name) > 1

A records pointing at IP addresses belonging to more than one system:
cmsxrootd-site.fnal.gov (exists in u_cmdb_ci_dns_a_record with no referenced Hardware CI)