[jacksonsabey]

Emojis are disallowed in IDNA2008. \u1F63B is in the disallowed but you can still register it on some TLDs https://whois.domaintools.com/xn--238h.com vs https://whois.domaintools.com/xn--238h.cf

  Gmail for example still allows me to email myself at \u1F63B.*.com or xn--238h.*.com

http://unicode.org/reports/tr46/#Table_Data_File_Fields

You can see the complete list of characters here:

ftp://ftp.unicode.org/%2F/Public/idna/8.0.0/IdnaMappingTable.txt