InCommon metadata and discovery services are hosted at wayf.incommonfederation.org. Currently this hostname resolves to one of two identical servers, either in Michigan (207.75.165.125) or Ohio (192.148.244.135). The actual server used at any given point in time is unspecified and left to the discretion of InCommon operations. If one of the servers goes down or requires maintenance, the other can be brought up within minutes, with minimal disruption of services.
On December 15, 2010, the server in Ohio will be permanently cut over to an identical server in Indiana (140.182.44.53). This cut over will cause NO immediate disruption of services, but depending on the configuration of your environment, future services MAY be disrupted unless you take the following action.
If your SAML implementation (usually Shibboleth) or your metadata refresh processes are configured with hostnamewayf.incommonfederation.org (as opposed to an IP address), then there is NOTHING you need to do UNLESS you had to poke a hole in a firewall to configure metadata refresh in your environment. In that case, you should reconfigure your firewall settings to allow IP addresses 207.75.165.125 and 140.182.44.53 (not 192.148.244.135).
If you have questions, please send e-mail to incommon-admin@incommon.org.