einstein@taho ~ $ nslookup 88.191.20.88
Server:         192.168.10.1
Address:        192.168.10.1#53

Non-authoritative answer:
88.20.191.88.in-addr.arpa       name = sd-621.dedibox.fr.

Authoritative answers can be found from:

einstein@taho ~ $ nslookup sd-621.dedibox.fr
Server:         192.168.10.1
Address:        192.168.10.1#53

Non-authoritative answer:
Name:   sd-621.dedibox.fr
Address: 88.191.20.88