You can wildcard and use %h in your config

eg

Host *.eng
  Hostname %h.domainname.com
  User me

Now when you do ssh foo.eng it will try to connect to foo.eng.domainname.com as the user me.

% ssh foo.eng
ssh: Could not resolve hostname foo.eng.domainname.com: Name or service not known

(well, obviously I get an error before it's not a valid hostname for me!)

So now you only need one rule per country.

You can wildcard and use %h in your config

eg

Host *.eng
  Hostname %h.domainname.com

Now when you do ssh foo.eng it will try to connect to foo.eng.domainname.com.

You can add other options to this config as well; eg forcing the username

Host *.eng
  Hostname %h.domainname.com
  User me

Now when you do ssh foo.eng it will try to connect to foo.eng.domainname.com as the user me.

% ssh foo.eng
ssh: Could not resolve hostname foo.eng.domainname.com: Name or service not known

(well, obviously I get an error before it's not a valid hostname for me!)

So now you only need one rule per country.

You can wildcard and use %h in your config

eg

Host *.eng
  Hostname %h.domainname.com

Now when you do ssh foo.eng it will try to connect to foo.eng.domainname.com.

% ssh foo.eng
ssh: Could not resolve hostname foo.eng.domainname.com: Name or service not known

(well, obviously I get an error before it's not a valid hostname for me!)

So now you only need one rule per country.

You can wildcard and use %h in your config

eg

Host *.eng
  Hostname %h.domainname.com
  User me

Now when you do ssh foo.eng it will try to connect to foo.eng.domainname.com as the user me.

% ssh foo.eng
ssh: Could not resolve hostname foo.eng.domainname.com: Name or service not known

(well, obviously I get an error before it's not a valid hostname for me!)

So now you only need one rule per country.