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Sorry, we have no information about inet3.alexb.ch. alexb.ch is a domain controlled by two nameservers on different IP networks. Incoming mail for alexb.ch is handled by one mailserver at alexb.ch themselves. alexb.ch has one IP number , but the reverse is inet.alexb.ch.

alexb.ch
a records
 
+ 62.2.214.115 62.2.0.0/16 AS8404 inet.alexb.ch
+ --- inet.alexb.ch
ns-soa records
inet.alexb.ch
+ 62.2.214.115 62.2.0.0/16 AS8404 -
+ --- -
ns records
inet.alexb.ch
+ 62.2.214.115 62.2.0.0/16 AS8404 -
+ --- -
ns0.iwebsl.com
+ 72.38.66.2 72.38.0.0/16 AS7992 s72-38-66-2.static.comm.cgocable.net
+ --- s72-38-66-2.static.comm.cgocable.net
mx records
inet.alexb.ch
+ 62.2.214.115 62.2.0.0/16 AS8404 -
+ --- -
ip numbers using ptr to this host
62.2.214.116