Non-null host-address bits

[karolyi]

Hey,

recently I started to get these errors:

Sep 25 18:51:04 ksol postfix/postscreen[83636]: warning: cidr map /usr/local/etc/postfix/postscreen_spf_whitelist.cidr,
 line 5: non-null host address bits in "2a01:111:f400:7c00::/48", perhaps you should use "2a01:111:f400::/48" instead:
skipping this rule

I have no idea as to what this could be, I run the list generation normally each day.