Однако whois с такими именами работает.
$ whois президент.рф
% By submitting a query to RIPN's Whois Service
% you agree to abide by the following terms of use:
% http://www.ripn.net/about/servpol.html#3.2 (in Russian)
% http://www.ripn.net/about/en/servpol.html#3.2 (in English).
domain: XN--D1ABBGF6AIIY.XN--P1AI
nserver: acl.dns.ripn.net.
nserver: bcl.dns.ripn.net.
nserver: ccl.dns.ripn.net.
nserver: ns2.gov.ru.
nserver: ns.gov.ru.
state: REGISTERED, DELEGATED, VERIFIED
org: Spetssvyaz FSO RF
registrar: RUCENTER-RF
admin-contact: https://www.nic.ru/whois
created: 2009-11-24T15:03:55Z
paid-till: 2021-11-24T15:03:55Z
free-date: 2021-12-25
source: TCI
Last updated on 2020-09-30T08:11:32Z
$ ping XN--D1ABBGF6AIIY.XN--P1AI
PING XN--D1ABBGF6AIIY.XN--P1AI (95.173.136.80) 56(84) bytes of data.
^C
--- XN--D1ABBGF6AIIY.XN--P1AI ping statistics ---
9 packets transmitted, 0 received, 100% packet loss, time 8183ms