for example

if I have R1 connected to R2

R1 =10.10.10.9 /30
R2 = 10.10.10.10 / 30
My subnet ID=10.10.10.8
R1#config t
      router ospf 110
      network 10.10.10.8  0.0.0.3 area 0
subnet ID          wild cards

If you want to Advertise on R2#
R2#config t
        router ospf 110
        network 10.10.10.8 0.0.0.3 area 0

[bs_icon name=”glyphicon glyphicon-chevron-right”] [bs_icon name=”glyphicon glyphicon-chevron-right”] Method #2 )

sometimes they give you WILD cards and you have to understand what it covers

[bs_icon name=”glyphicon glyphicon-chevron-right”] hint : Always always the wild cards is one number less than BLOCK size

so If I say
network 10.10.10.0 0.0.0.3 that means I am advertising block size of 4

10.10.10.0
.1
.2
.3 so i am advertising a block size of 4

If I have Network 10.10.10.0 0.0.0.7 area 0
that means I am advertising block of 8

that is I am including 10.10.10.0
                                                    .1 ,.2 .3 .4 .5 .6 .7