The messages are from Sprint and contain information programming on your phone is supposed to intercept (note: with Boost using Sprint's network, it seems this message also is delivered to Boost customers). It is NOT an ipv6 address in the path; ipv6 addresses contain 6 parts.
It's basically trying to download and install something official on your phone, but something messed up in the process. The very last number references what, exactly, is supposed to be downloaded--an update for Connections Optimizer or some other thing. Who knows, since we can't, to my knowledge, cross check that string against a server. If someone could get the server from which this serious m stuff downloads, it would be possible, but it's not important anyway.