Playing around, a lot of countries use this url scheme:

https://data.gov.be

http://data.gov.ro/

https://www.dati.gov.it/ (note, Italy redirects data. to dati.)

https://data.gov.pl/

https://data.gov.za/ (South Africa's has a cert problem)

https://data.gov.in

https://data.gov.au/

https://datos.gob.mx/