ssl сертификат для поддомена - SERP Analysis

https://help.reg.ru/support/ssl-sertifikaty/obshchaya-informatsiya-po-ssl/zashchita-poddomenov-ssl-sertifikat-s-podderzhkoy-poddomenov

https://www.ssldragon.com/ru/blog/what-is-ssl-for-subdomain/

https://qna.habr.com/q/325368

https://www.youstable.com/ru/%D0%91%D0%BB%D0%BE%D0%B3/%D0%B1%D0%B0%D0%B7%D0%B0-%D0%B7%D0%BD%D0%B0%D0%BD%D0%B8%D0%B9/%D0%BA%D0%B0%D0%BA-%D1%83%D1%81%D1%82%D0%B0%D0%BD%D0%BE%D0%B2%D0%B8%D1%82%D1%8C-ssl-%D0%BD%D0%B0-%D0%BF%D0%BE%D0%B4%D0%B4%D0%BE%D0%BC%D0%B5%D0%BD/

https://www.ssl.com/ru/%D1%81%D1%82%D0%B0%D1%82%D1%8C%D1%8E/%D1%87%D1%82%D0%BE-%D1%82%D0%B0%D0%BA%D0%BE%D0%B5-%D0%BF%D0%BE%D0%B4%D1%81%D1%82%D0%B0%D0%BD%D0%BE%D0%B2%D0%BE%D1%87%D0%BD%D1%8B%D0%B9-ssl-%D1%81%D0%B5%D1%80%D1%82%D0%B8%D1%84%D0%B8%D0%BA%D0%B0%D1%82/

https://hoster.by/help/ssl-sertifikaty/kak-vybrat-ssl-sertifikat/

https://firstssl.ru/ssl/wildcard

https://www.reg.ru/ssl-certificate/ssl-wildcard/

https://onehost.kz/help/ssl-sertifikaty/zashchita-poddomenov-ssl-sertifikat-s-podderzhkoy-poddomenov/

https://www.nic.ru/catalog/ssl/wildcard/