I want a subdomains on 1 ip address without domain: http://sd1.192.81.220.227 http://sd2.192.81.220.227 … http://sdN.192.81.220.227
how configure virtual hosts I know, I don’t know how configure Networking Domain (https://cloud.digitalocean.com/networking/domains)
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You can’t exactly have that, but there are workarounds, try out these services - xip[dot]io and nip[dot]io, with them you can have as many sub domains as you want.
IP addresses can’t have subdomains, you must register a domain and then add an A record for your sdN.yourdomain.tld pointing to the server IP, alternatively you can add *.yourdomain.tld that way all 3rd level domains get routed to your server unless you specify differently, or lastly, create an A record for servername.yourdomain.tld, point that to your server, then create a CNAME record for sdN.yourdomain.tld and point it to servername.yourdomain.tld.
Note that this is completely unrelated to both Networking and FreeBSD, the term you’re looking for is DNS