Something

NameVirtualHost ip1
NameVirtualHost ip2
NameVirtualHost ip3

<VirtualHost ip1>
  ServerName domain1.tld
  DocumentRoot /var/www/ip1
  # blah blah blah... Options, whatever...
</VirtualHost>

<VirtualHost ip2>
  ServerName domain2.tld
  DocumentRoot /var/www/ip2
  # blah blah blah... Options, whatever...
</VirtualHost>

<VirtualHost ip3>
  ServerName domain3.tld
  DocumentRoot /var/www/ip3
  # blah blah blah... Options, whatever...
</VirtualHost>