Router#show ip arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  192.168.3.123          21   001c.23f9.d931  ARPA   FastEthernet0/0
Internet  192.168.3.75            7   0025.648f.c6be  ARPA   FastEthernet0/0
Internet  192.168.3.39            -   001e.7ae0.4740  ARPA   FastEthernet0/0
Internet  192.168.3.10           24   0025.64a3.59bf  ARPA   FastEthernet0/0
Internet  192.168.3.1             0   001f.1255.a902  ARPA   FastEthernet0/0
Internet  192.168.6.5            10   0025.648f.c6be  ARPA   FastEthernet0/1
Internet  192.168.6.1             -   001e.7ae0.4741  ARPA   FastEthernet0/1

#show arp | in 172.16.1.2

#show mac-address-table dynamic interface Fa0/3