show ip sockets details or show socket detail – will give you a list of open ports.
If that command is not supported you can look at the pid and do a show sockets (pid) detail
Rack01R1#sh processes | i DHCP
42 Mwe 61554938 72 4486 16 5496/6000 0 DHCPD Timer
132 Mwe 61D37488 780188 1074772 72510568/12000 0 DHCPD Receive
151 Msi 6155CC30 464 8975 51 5124/6000 0 DHCPD Database
248 Mwe 6153E90C 93604 537591 174 6424/9000 0 DHCP Client
Rack01R1#show sockets 132 detail
FD LPort FPort Proto Type TransID
0 67 0 UDP DGRAM 0x672F5140
State: SS_ISBOUND
Options: SO_BROADCAST
Total open sockets – TCP:0, UDP:1, SCTP:0
You can also get some information for the control-plane host.
Rack01R1#sh control-plane host open-ports
Active internet connections (servers and established)
Prot Local Address Foreign Address Service State
tcp *:23 *:0 Telnet LISTEN
tcp *:80 *:0 HTTP CORE LISTEN
udp *:67 *:0 DHCPD Receive LISTEN
udp *:68 *:0 BootP client LISTEN