6. http://www.chiark.greenend.org.uk/~ian/adns/adns.h.txt
7. http://www.chiark.greenend.org.uk/~ian/adns/adnsresfilter.txt
8. ftp://ftp.chiark.greenend.org.uk/users/ian/adns/
- 9. http://www.chiark.greenend.org.uk/~/ian/adns/ftp/
+ 9. http://www.chiark.greenend.org.uk/~ian/adns/ftp/
10. http://www.chiark.greenend.org.uk/ucgi/~ijackson/cvsweb/adns/
11. http://www.gnu.org/
12. http://www.gnu.org/order/ftp.html