.doosan today became the first new gTLD to be removed from the domain name system.
It’s no longer showing up in the DNS root zone file, and IANA’s record lists it as “retired”.
.doosan was a dot-brand managed by Korean conglomerate Doosan Group. The company never did anything with it before deciding to kill the TLD off last September.
A month ago, ICANN used the pending deletion to test its Emergency Back-End Registry Operator safety net.
If memory serves, it’s the only gTLD to be ever be removed from the root zone, excluding test internationalized TLDs previously operated by ICANN.
ccTLDs are removed somewhat regularly, when international borders are redrawn.