Changes to api.yubico.com

We have upgraded api.yubico.com and its IP addresses have changed.

While you should never hard code any of our IPs in your application or firewall, please do note the new addresses below.

New IPv4: 23.253.41.154
New IPv6: 2001:4801:7824:103:be76:4eff:fe10:77c6

Old IPv4: 67.207.136.212
Old IPv6: 2001:470:1f10:4df::2

If you must firewall your outgoing connections, you might be able to use DNS hostnames in your ruleset.

iptables and pf support this, but you must make sure to periodically reload your ruleset, otherwise changes to the DNS zones are not picked up.