Our primary web servers at this domain don't make any outgoing HTTP connections. It's our application servers (which are behind firewalls) which you may wish to add to allow or deny lists.
External services may see the following IP addresses, which are exclusively for our use:
IPv4
176.58.127.51
212.71.244.39
178.79.190.224
85.159.214.20IPv6
2a01:7e00::f03c:95ff:fe6e:e1df
2a01:7e00::f03c:91ff:fe60:48f0
2a01:7e00::f03c:91ff:fefb:d903
2a01:7e00::f03c:91ff:fefb:d920