<https://www.engeniusnetworks.eu/forums/users/alecejones/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/Person>
<https://www.engeniusnetworks.eu/faq-question/subnet-mask-and-cidr-how-many-valid-hosts-can-be-used-on-a-specific-subnet-classless-addressing/>