<PackageReference Include="BouncyCastle.Cryptography" Version="2.7.0" />

Org.BouncyCastle.Pkix.NameConstraintHostNameKind

Shape classification of a string-host name-constraint value, fixed at construction.
namespace Org.BouncyCastle.Pkix { internal enum NameConstraintHostNameKind : byte { Mailbox, AtHost, Host, Domain } }