How to set up one or more sub-domain on a different servers

Hello there
I need to set up few sub-domains on different servers, what would be the correct way to do this?
Main Domain records is handled by BIND locally and domain name is pointing to the server IP using Child Nameservers. is a server created on another machine with a different IP, I have added an A record as per below however this is not working for me IN A

my current BIND Records File looks like this

$ttl 38400 IN SOA localhost. (
38400 )
@ IN NS localhost. IN A IN A IN A IN A IN A IN A IN A IN A IN MX 5 IN TXT “v=spf1 a mx ip4: ?all” IN A


It looks like what you have there should work… what isn’t working properly, is the name not resolving?

One thing you might try is to restart BIND, just to make sure that particular record is active.