WHOIS Details:

WhoisDog failed to connect to WHOIS server: whois.nic.ht

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

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