If you know the specific port and are running EXOS 16.1+, a new command was added. show iparp port
Older versions where the "pipe" include option is available, you can specify port number that way. Here's an example with port 10.
# show iparp | include "10$"
VR-Default 10.67.71.17 00:04:96:35:d0:90 0 NO row_K-mgmt 1071 10
VR-Default 10.67.71.36 00:21:d7:e9:27:c1 13 NO row_K-mgmt 1071 10
VR-Default 10.67.71.38 00:04:96:6d:55:52 8 NO row_K-mgmt 1071 10
VR-Default 10.67.71.45 00:04:96:52:d8:31 8 NO row_K-mgmt 1071 10
VR-Default 10.67.71.52 00:04:96:36:5f:51 8 NO row_K-mgmt 1071 10
VR-Default 10.67.71.54 00:04:96:36:5f:58 8 NO row_K-mgmt 1071 10
VR-Default 10.67.70.63 00:80:a3:35:2e:57 3 NO termsvr_pdu 1070 10