I don’t have any account on github, sorry.
I tried also with different numbers on the third octet, maybe is only a matter of the fourth octet for being validated.
All /28 subnets seems ok. Anyone can try the /29, /30 and also /31 missing subnets
I also tried to feed a wrong subnet id, and it was detected.
I don’t know if it’s a bug, but if i change settings, disable the server, and i click on save, the subnet id and mask can still be edited and saved while clicking on save.
Only if i reload the page edit is disabled.