My free DXCC Excel spreadsheet is updated now with the latest changes:

Montenegro is now 4O

Serbia is now YT, YU

The prefixes 4N and YZ are given back to the ITU, but at the moment they
are still in use. I guess it will take some time to re-organise the
callsign-systems in both countries.

You can find the DXCC Excel spreadsheet in which you can keep record of
your DXCC score for all HF bands and 6 meters on my website. There is also
a WAS/WAZ spreadsheet available.

Take a look a www.pg7v.net

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73's, JanJaap PG7V
http://www.pg7v.net