HamQTH's API is pretty easy to use and provides a decent international
callbook.
http://hamqth.com/developers.php
I use it for validation and profile at
http://hf.dstar-relay.net and
http://qso.freedv.org
If someone wanted to write a simple callsign lookup, it wouldn't be a big
deal.
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John D. Hays
K7VE
PO Box 1223, Edmonds, WA 98020-1223
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