Active MAC Address – How to View Active MAC Address Only on a Port

I have a port on a switch configured with port-security and sticky option.

interface FastEthernet0/18
...
 switchport port-security maximum 2
 switchport port-security
 switchport port-security mac-address sticky
 switchport port-security mac-address sticky 78e7.d1b4.8e14
 switchport port-security mac-address sticky 0060.b955.c003 vlan voice
...
end

The IP phone is no longer connected to this port. If I show the MAC addresses on the port, both addresses are shown.

#show mac address-table int fa0/18
 Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports
---- ----------- -------- -----
 491 0060.b955.c003 STATIC Fa0/18
 413 78e7.d1b4.8e14 STATIC Fa0/18
Total Mac Addresses for this criterion: 2

How can I view only the active MAC address, not including sticky addresses no longer there? show mac address-table dynamic does not show the one still there because it is now static due to being recorded by the sticky statement.

By active, I mean that the device is still connected and sending packets on that port – as opposed to just still be recorded as a sticky mac address.

Netdisco, for example, is somehow able to tell the difference when it performs its macsuck operation:

select mac, port, active from node where port = 'FastEthernet0/18';

mac                 port                active
78:e7:d1:b4:8e:14   FastEthernet0/18    true
00:60:b9:55:c0:03   FastEthernet0/18    false