Shiptheory connects to your system and to carrier systems to exchange order data, and the Shiptheory Print Client connects to your printers so it can send labels to them. If a firewall or network restriction blocks either of these, you may see connection or printing errors.


Ask your system administrator or IT team to whitelist the IP addresses and ports below.


Shiptheory platform IP addresses

Add these at your web host and at any proxies you use, such as Cloudflare or Fastly:

  • 18.134.120.59
  • 67.227.254.115

  • 69.16.195.57

  • 172.94.14.108

  • 185.52.109.17 

  • 81.133.234.202
  • 3.10.113.214


Ports: 80, 443 and 6123



Shiptheory Print Client IP addresses

If you use the Shiptheory Print Client, you may also need to add rules on the network your warehouse printers are on. This applies if your device can’t reach the Print Client because of restrictions on the device or the network.

  • 5.10.27.35
  • 5.10.27.36
  • 5.10.27.37
  • 5.10.27.38
  • 5.10.27.39
  • 51.89.234.183
  • 51.195.131.83
  • 5.10.23.32/27 (that is, 5.10.23.32 – 5.10.23.63)
  • 81.133.234.202
  • 94.228.44.135


Ports: the Print Client needs ports 6123, 443 and 80 open for outbound TCP connections. They don’t all have to be open, because the Print Client uses the first one it can connect on.