Solved Searching for MAC address on network

I have a GoFlex Home unit which I'm trying to bring back to life and I don't know its IP address. The MAC address is printed on the box. When I switch it on it started blinking and eventually ends up with a steady green led, which I believe means it has contacted the LAN. Can I detect its presence on the LAN from its MAC address?
 
Well go to your pfSense box or whatever your DHCP server is and check.
Alternately the nmap port can do this:
nmap 192.168.1.0/24
For a 192.168.1.0 network. Hit return to see status. It takes a while.
net/netmap
 
arping()
# arping -c 3 00:11:85:4c:01:01
ARPING 00:11:85:4c:01:01
60 bytes from 88.123.180.225 (00:11:85:4c:01:01): icmp_seq=0 time=13.367 msec
60 bytes from 88.123.180.225 (00:11:85:4c:01:01): icmp_seq=1 time=13.929 msec
60 bytes from 88.123.180.225 (00:11:85:4c:01:01): icmp_seq=2 time=13.929 msec

--- 00:11:85:4c:01:01 statistics ---
3 packets transmitted, 3 packets received, 0% unanswered
 
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