AFAIK those with protected addresses has not had their address compromised. But ID and name still is.
And with the rest exposed it is now trivial to see what adresses are "interesting".
I did it accidentally during my last move and it was a pain in the behind
And it expires after a year by default so it feels rather pointless
Domain: ft.dk
DNS: ft.dk
Registered: 1995-07-04
Expires: 2027-09-30
Registration period: 1 year
VID: no
DNSSEC: Signed delegation
Status: Active
Registrant
Handle: DATA REDACTED
Name: Folketinget
Address: Christiansborg Slot 1
Postalcode: 1218
City: København K
Country: DK
Phone: +4533375500
Email: webmaster@ft.dk
ID status: ID verified via electronic ID
Nameservers
Hostname: maleah.ns.cloudflare.com
Hostname: yichun.ns.cloudflare.com
This is why I've never posted anything from my own shitty website here. All of this is available from [myname].dk with my info on it. Also it's horrifying that our government is restricting access to its website behind fucking CloudFlare.EDIT: I didn't redact anything from the lookup, this is the exact data I received.
I managed to get protected address, it's just to log in somewhere and request it. I can't remember the details, but it made for example banking _slightly_ more annoying. They would call me so they can send me a letter. Also makes it harder for people who know your name to look up your address.
Never managed to get my name removed from my domain whois and at some point removed protected address again. In theory, if I share one of my other .com domains on the internet, an attacker could reverse DNS the IP, find my DK domain and thus get my full name and address.
There are exceptions where the encoded birth date will be wrong (like immigrants with unknown birth dates) or dates where there are more people than the 4 digits that encode checksum validation and gender can handle.
Then again, in my country some municipalities handed out numbers starting with your birth year....
Gender is encoded in the CPR number.
There is some interesting details that may require you to change your name, if you want the last digit changed. That means if you're name is Kurt, you can't have a CPR number ending in an even number, because Kurt is only an approved name for men. If your name is Kim, Storm, Charlie, Orla, Lykke or some other unisex name it's not a problem.