Today's border closures: Ireland (34.1), Iceland (32.7), Slovenia (30.7) and the United Kingdom (36.4).
Denmark recommends against travel to regions in open countries if the region has a rate exceeding 50. Currently this is the case with Blagoevgrad (98.4) in Bulgaria, Ida-Viru Maakond (266.2) and Vőru Maakond (56.0) in Estonia, Provincia Autonomia Di Trento (70.4) and Liguria (58.6) in Italy, Vestland (56.5) in Norway and Bratislavsky (78.8) in Slovakia.
If a Nordic country is closed, then Denmark still allows entry to people living in safe regions in that country. When Sweden was closed in June and July, there was a separate list with open and closed Swedish counties. Iceland was closed today, but I can't find a list with open and closed Icelandic regions.