Well if you mean to assign a name for each port then you just add them to you Bind Domain name
server. here is what mine look like.
ppp-mia-20 IN A 205.152.26.20
ppp-mia-21 IN A 205.152.26.21
ppp-mia-22 IN A 205.152.26.22
ppp-mia-23 IN A 205.152.26.23
ppp-mia-24 IN A 205.152.26.24
ppp-mia-25 IN A 205.152.26.25
I hope this is what you meant. I am assuming the @ sign you put there is suppose to be a
period.
Oh and dont forget the reverse lookups