MyDNS.JP is Dynamic DNS.
If you set and run Server at HOME, SCHOOL, COMPANY, or VPS etc, MyDNS.JP is very useful and versatile DNS.
MyDNS.JP is powered by PowerDNS.
"The PowerDNS daemon is a versatile nameserver which supports a large number of backends. These backends can either be plain zonefiles or be more dynamic in nature. Additionally, through use of clever programming techniques, PowerDNS offers very high domain resolution performance."
So, MyDNS.JP select and build with PostgreSQL. (and PHP7.2, Nginx, and Linux!)
You send to MyDNS.JP your IP address, MyDNS.JP apply hostname and IP address to PowerDNS, very quickly.
Easy to USE
You have to notify your IP address to MyDNS.JP, by POP3, IMAP4, FTP, HTTP-BASIC, and or Direct Input.
POP3 and IMAP4, It is very easy protocol. you use it everyday.
You do not need special software.
You add MAIL account setting to Mailer on your server, or you edit a few line script by Perl, PHP.
If you have AXIS or Panasonic network web camera, almost it is include FTP.
You can set "MyDNS.JP's Sub Domain" (list) or "Original Domain" that you have , both are also Free!
ex:tokyo.mydns.jp, taipei.mydns.tw, myserver.server-on.net etc...
"Original Domain" can be setting also free! but, you must pay to get a domain. ;-)
Also, Multi-Byte Domain Name is OK, please convert to punny-code.