The best replacement for ip address is mac address.

The best alternatives to ip address are rated as following:
★★★★★  mac address
★★★★  url
★★★★  domain name
★★★  dns
★★★  hostname
★★  subnet mask
★★  static ip address
★★  dynamic ip address
★★  default gateway
★★  dns name
★  gateway
★  private ip address
★  physical address
★  dynamic
★  ipv4
★  network address
★  domain name of the server
★  name
★  fqdn
★  computer name
★  subnet
★  server name
  gateway address
  host name
  router address
  public ip address
  static
  dynamic ip
  ethernet address

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

Other search terms related to ip address and their ratings are:
★★★★★ port
★★★ dhcp
★★ admin rights
★★ subnet mask
★★ another system on the network
★ mac address
★ network
★ proxy
★ 169
★ location
★ port number
★ dns
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Google Trends

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