I assume there's a route print command available

No, that information is supplied by netstat:

# netstat -nr

Routing Table: IPv4
  Destination           Gateway           Flags  Ref   Use   Interface
-------------------- -------------------- ----- ----- ------ ---------
172.17.0.0           172.17.0.101         U         1 562395  hme0
224.0.0.0            172.17.0.101         U         1      0  hme0
default              172.17.0.6           UG        1 113291
127.0.0.1            127.0.0.1            UH       20  13053  lo0
[download]

You will want to to see whether the target address is matched by any of the addresses (hosts or networks) in the first column. cpan::Net::CIDR features Net::CIDR::cidrlookup will help in this regard. If none of them match then the default address is used.

Aliases on Solaris cards follow the standard convention. E.g. if the first interface is hme0, the first alias will be named hme0:1 and so forth. You can enumerate the interfaces on the machine by parsing the output of ifconfig -a. AFAIK there are no modules that offer this functionality... Now there's an itch to be scratched...

update: it's been a while... I was a bit wrong with the netstat switches. You need netstat -nrv which looks like:

# netstat -nrv

IRE Table:
  Destination             Mask           Gateway          Device Mxfrg
+  Rtt  Ref Flg  Out  In/Fwd
-------------------- --------------- -------------------- ------ -----
+ ----- --- --- ----- ------
10.0.1.0             255.255.255.0   172.17.0.21                  1500
+*    0   0 UG       0     0
172.17.0.0           255.255.224.0   172.17.0.1           hme0    1500
+*    0   3 U   201577     0
224.0.0.0            240.0.0.0       172.17.0.1           hme0    1500
+*    0   3 U        0     0
default              0.0.0.0         172.17.0.6                   1500
+*    0   0 UG  728283     0
127.0.0.1            255.255.255.255 127.0.0.1            lo0     8232
+*    0   0 UH     221     0
[download]

You need to look at the Destination and Mask columns to determine if you are looking at a host or a network