WHOIS Details:

WhoisDog failed to connect to WHOIS server: whois.tonic.to

Root Zone Database:
https://www.iana.org/domains/root/db/to.html

Try these WHOIS services:
http://whois.tonic.to
http://tian.hu/deep.to
http://whois.gd/deep.to
http://who.cx/deep.to
http://whois.domaintools.com/deep.to
https://whois.gandi.net/en/results?search=deep.to
https://www.godaddy.com/whois/results.aspx?checkAvail=1&domain=deep.to&prog_id=GoDaddy
https://www.namecheap.com/domains/whois/results.aspx?domain=deep.to
https://who.is/whois/deep.to/