option dhcp-server-identifier 10.0.0.138;
  option dhcp-server-identifier 10.0.0.138;
  option dhcp-server-identifier 10.0.0.138;
  option dhcp-server-identifier 10.0.0.138;
  option dhcp-server-identifier 10.0.0.138;
  option dhcp-server-identifier 10.0.0.138;
  option dhcp-server-identifier 10.0.0.138;
  option dhcp-server-identifier 10.0.0.138;
  option dhcp-server-identifier 10.0.0.138;
  option dhcp-server-identifier 10.0.0.138;

they look to be the same...
however, are not able to interpret this value ...

------------------------

here I write two complete records (the last two):

lease {
  interface "em0";
  fixed-address 10.0.0.1;
  option subnet-mask 255.255.255.0;
  option routers 10.0.0.138;
  option dhcp-lease-time 3600;
  option dhcp-message-type 5;
  option domain-name-servers 10.0.0.138;
  option dhcp-server-identifier 10.0.0.138;
  option domain-name "Home";
  renew 2 2014/10/07 08:05:32;
  rebind 2 2014/10/07 08:29:41;
  expire 2 2014/10/07 08:37:11;
}
lease {
  interface "em0";
  fixed-address 10.0.0.3;
  option subnet-mask 255.255.255.0;
  option routers 10.0.0.138;
  option dhcp-lease-time 3600;
  option dhcp-message-type 5;
  option domain-name-servers 10.0.0.138;
  option dhcp-server-identifier 10.0.0.138;
  option domain-name "Home";
  renew 2 2014/10/07 08:34:07;
  rebind 2 2014/10/07 08:58:03;
  expire 2 2014/10/07 09:05:33;
}

what it mean ?