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tulasvu.qui.monq.org are subdomains to this hostname. monq.org is a domain controlled by two nameservers at w1p.fr. They are on different IP networks. Incoming mail for monq.org is handled by two mailservers also at w1p.fr. They are on the same IP network. monq.org has one IP number , but the reverse is mx.w1p.fr.

monq.org
a records
 
+ 88.191.88.189 88.160.0.0/11 AS12322 mx.w1p.fr
+ --- mx.w1p.fr
ns-soa records
ns1.w1p.fr
+   AS?  
+ ---  
ns records
ns1.w1p.fr
+   AS?  
+ ---  
ns2.w1p.fr
+ 88.191.90.189 88.160.0.0/11 AS12322 mx2.w1p.fr
+ --- mx2.w1p.fr
mx records
mx.w1p.fr
+ 88.191.88.189 88.160.0.0/11 AS12322 -
+ --- -
mx2.w1p.fr
+ 88.191.88.19 88.160.0.0/11 AS12322 -
subdomains
*.qui.monq.org
tulasvu.qui.monq.org