whois jigsaw.w3.org/css-validator/validator?uri=nalogiexpert.ru/lgoty/kak-rasschitat-nalog-na-imushhestvo-v-2021-godu-pamyatka.html

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Try for webbased whois (don't expect it to work yet)

jigsaw.w3.org/css-validator/validator?uri=nalogiexpert.ru/lgoty/kak-rasschitat-nalog-na-imushhestvo-v-2021-godu-pamyatka.html
checking....jigsaw.w3.org/css-validator/validator?uri=nalogiexpert.ru/lgoty/kak-rasschitat-nalog-na-imushhestvo-v-2021-godu-pamyatka.html
   $ whois jigsaw.w3.org/css-validator/validator?uri=nalogiexpert.ru/lgoty/kak-rasschitat-nalog-na-imushhestvo-v-2021-godu-pamyatka.html
No whois server is known for this kind of object.