keyset-3.1.192.in-addr.arpa.

This a good VPN source

$ORIGIN .
3.1.192.in-addr.arpa	604800	IN KEY	256 3 1 (
					AQPIB28nwfp98i6zPRUiyehbphJPirDctx2q
					awNYH8t73LD+bwi5dRel3u6nJtiqvm7CAK3x
					XSiGLwcvID6cmazt
					) ; key id = 39340