get lsof from http://www.sunfreeware.com

lsof will also list all the ports a process is using.

e.g

sun#lsof -p 165
COMMAND PID USER   FD   TYPE     DEVICE SIZE/OFF  INODE NAME
inetd   165 root  cwd   VDIR      32,24     1536      2 /
inetd   165 root  txt   VREG      32,30    33428 170009 /usr (/dev/dsk/c0t3d0s6)
inetd   165 root  txt   VREG      32,30    10696   7696 /usr/lib/straddr.so.2
inetd   165 root  txt   VREG      32,30    89400   7669 /usr/lib/libresolv.so.2
inetd   165 root  txt   VREG      32,30     9804   7689 /usr (/dev/dsk/c0t3d0s6)
inetd   165 root  txt   VREG      32,30    30348   7691 /usr/lib/nss_nis.so.1
inetd   165 root  txt   VREG      32,30    27000   7690 /usr/lib/nss_files.so.1
inetd   165 root  txt   VREG      32,30    19304   7662 /usr/lib/libmp.so.2
inetd   165 root  txt   VREG      32,30  1009696   7645 /usr/lib/libc.so.1
inetd   165 root  txt   VREG      32,30    93548   7644 /usr/lib/libbsm.so.1
inetd   165 root  txt   VREG      32,30   717948   7663 /usr/lib/libnsl.so.1
inetd   165 root  txt   VREG      32,30    53656   7674 /usr/lib/libsocket.so.1
inetd   165 root  txt   VREG      32,30     4284   7652 /usr/lib/libdl.so.1
inetd   165 root  txt   VREG      32,30   155060   7639 /usr/lib/ld.so.1
inetd   165 root    0r  VDIR      32,24     1536      2 /
inetd   165 root    1r  VDIR      32,24     1536      2 /
inetd   165 root    2r  VDIR      32,24     1536      2 /
inetd   165 root    4u  inet 0xf5971238      0t0    TCP *:ftp (LISTEN)
inetd   165 root    5u  inet 0xf5ea52d0      0t0    TCP *:telnet (LISTEN)
inetd   165 root    6u  inet 0xf5ea51d0      0t0    TCP *:keytelnet (LISTEN)
inetd   165 root    7u  inet 0xf5ea5150      0t0    TCP *:keyftp (LISTEN)
inetd   165 root    8u  inet 0xf5ea50d0      0t0    TCP *:shell (LISTEN)
inetd   165 root    9u  inet 0xf5ea5050      0t0    TCP *:login (LISTEN)
inetd   165 root   10u  inet 0xf5ea5850      0t0    TCP *:exec (LISTEN)
inetd   165 root   11u  inet 0xf5efded8      0t0    TCP *:time (LISTEN)
inetd   165 root   12u  inet 0xf5efddd8      0t0    UDP *:32815 (Idle)
inetd   165 root   13u  inet 0xf5efdf58      0t0    UDP *:34752 (Idle)