We want to check which ccTLDs have no associated country information (so that we can investigate why).
$ go run tools/cctldmissing/main.go
[INFO] found table [columns [Domain Type TLD Manager] count 1591]
[INFO] found table [columns [Domain Names Root Zone Registry.INT Registry.ARPA RegistryIDN Repository] count 3]
[WARNING] Count not find country information associated with ccTLD ".ac"
[WARNING] Count not find country information associated with ccTLD ".eu"
[WARNING] Count not find country information associated with ccTLD ".su"
Explaination of the above ccTLDs' missing countries: see here and here. Saint Helena has a ccTLD .ac, but country code SH. .su is for Soviet Union, but as it is no longer a country (e.g., ISO 3166-3). .eu is the country code for the European Union, which isn't a country.