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This question because bothdigandnslookupfail when FF succeeds. Is there some other command line tool that can handle IDN (I tried with double quote the DN).

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IDN domains are translated before they're queried. The browser does this conversion.

You can install the tool idn to translate - sudo apt-get install idn. Enter the domain you want to translate, and press enter:

$ idn
libidn 1.29
Copyright 2002-2014 Simon Josefsson.
GNU Libidn is free software with ABSOLUTELY NO WARRANTY.  For more
information about these matters, see <http://www.gnu.org/licenses/>.
Type each input string on a line by itself, terminated by a newline character.
løk.no
xn--lk-lka.no

You can also specify it as a parameter:

$ idn løk.no
xn--lk-lka.no

You can also use a website tool, like https://www.punycoder.com/

The translated name can then be resolved using standard command line tools like dig or nslookup, or used in non-IDN-aware applications.

You can also pipe this straight into nslookup:

$ idn løk.no | nslookup
Server:         10.1.12.15
Address:        10.1.12.15#53

Non-authoritative answer:
Name:   xn--lk-lka.no
Address: 212.125.204.196

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