go
f1sa.gr, tatoulis.gr and daliscafe.com use this as a nameserver. pna.gr is a domain controlled by two nameservers at enameservers.net. They are on different IP networks. Incoming mail for pna.gr is handled by one mailserver at gr. pna.gr has one IP number , but the reverse is t-rex.enameservers.net.

pna.gr
a records
 
+ 69.16.197.15 69.16.192.0/19 AS32244 t-rex.enameservers.net
+ --- t-rex.enameservers.net
ns-soa records
ns1.enameservers.net
+ 69.16.196.251 69.16.192.0/19 AS32244  
+ ---  
ns records
ns1.enameservers.net
+ 69.16.196.251 69.16.192.0/19 AS32244  
+ ---  
ns2.enameservers.net
+ 209.59.143.115 209.59.128.0/19 AS32244 mastodon.enameservers.net
+ --- mastodon.enameservers.net
mx records
pna.gr
+ 69.16.197.15 69.16.192.0/19 AS32244 t-rex.enameservers.net
+ --- t-rex.enameservers.net
domains using this as nameserver
daliscafe.com
f1sa.gr
tatoulis.gr
used as nameserver but missing in parent delegation
f1sa.gr