The best replacement for mac address is ip address.

The best alternatives to mac address are rated as following:
★★★★★  ip address
★★★★  physical address
★  ipv6
★  ethernet address
★  ip
★  wifi address
★  imei
★  uuid
★  bssid
★  host id
★  ssid
  hardware address
  lan mac address
  serial number
  ethernet id
  network layer address
  udid

Your alternative for mac address is not listed? Suggest!
Speaking about mac address, one probably shouldn't forget about ip.

Other search terms related to mac address and their ratings are:
★★★★★ ip
★★★ ipconfig
★★ ip address
★★ ping
arp
nmap
tcpdump
You have in mind a companion for mac address and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of mac address in all years. Click on graph for more.
mac address
ip address
physical address