go
f.fi has one IP number , which also has a corresponding reverse pointer. fi use this as a nameserver. f.fi is hosted on a server in Finland.

f.fi
a records
 
+ 87.239.127.198 87.239.120.0/21 AS39662 -
+ --- -

fi
ns-soa records
a.fi
+ 193.166.4.1 193.166.0.0/15 AS1741 tld.ficora.fi
+ --- tld.ficora.fi
ns records
a.fi
+ 193.166.4.1 193.166.0.0/15 AS1741 tld.ficora.fi
+ --- tld.ficora.fi
b.fi
+ 194.146.106.26 194.146.106.0/24 AS8674 fi1.dnsnode.net
+ --- fi1.dnsnode.net
c.fi
+ 128.214.4.29 128.214.0.0/16 AS1741 hydra.helsinki.fi
+ --- hydra.helsinki.fi
d.fi
+ 77.72.229.253 77.72.224.0/21 AS8674 -
+ --- -
e.fi
+ 194.0.1.14 194.0.1.0/24 AS42909 -
f.fi
+ 87.239.127.198 87.239.120.0/21 AS39662 -
ip numbers of host
87.239.127.198
ptrs of ip numbers
f.fi
ip numbers using ptr to this host
87.239.127.198
domains using this as nameserver
fi