[c-nsp] IOS XR ACL match host routes

[Adam Vitkovsky]

Hi,
Would anybody know how can I match on host routes using ipv4 access-list in
IOS XR?

I'd like to narow down the high spf prefix priority in ISIS to several
ranges and of course only host routes. 
Unfortunately with ISIS I can't use route-policy where  I could reference
prefix-set, as it only takes ipv4 acl.

I have tried the ussual:
permit ipv4 10.0.0.0 0.255.255.255 host 255.255.255.255
-to match for the host and mask portion
-like we all did before there where prefix lists
But it doesn't work

adam