$ curl -O http://ftp.apnic.net/apnic/dbase/data/country-ipv4.lst
$ more country-ipv4.lst | grep cn > cn-ipv4.lst
A One, Since 2004 or earlier
$ curl -O http://ftp.apnic.net/apnic/dbase/data/country-ipv4.lst
$ more country-ipv4.lst | grep cn > cn-ipv4.lst
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