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lt.nic.lv has one IP number , which also has a corresponding reverse pointer. lv use this as a nameserver. Incoming mail for nic.lv is handled by two mailservers at latnet.lv. They are on the same IP network. nic.lv has one IP number. lt.nic.lv is hosted on a server in Lithuania even though the hostname implies Latvia.

lt.nic.lv
a records
 
+ 83.171.8.137 83.171.0.0/19 AS2847 -
+ --- -

nic.lv
a records
 
+ 91.198.156.33 91.198.156.0/24 AS5538  
+ ---  
mx records
mx.latnet.lv
+ 92.240.66.33 92.240.64.0/19 AS5538 -
+ --- -
mx2.latnet.lv
+ 92.240.66.34 92.240.64.0/19 AS5538 -
ip numbers of host
83.171.8.137
ptrs of ip numbers
lt.nic.lv
ip numbers using ptr to this host
83.171.8.137
domains using this as nameserver
lv