Let's walk through this backwards: in 2002, the IETF adopter RFC 3330 -- which just attempts to categorize special-use IP ranges that have already been defined. One of the ranges mentioned, is the 127.0.0.0/8 block, which, crossreferencing RFC 1700, is an "Internal host loopback address. Should never appear outside a host."
Most frequently, nothing more then 127.0.0.1 gets used, but 127.0.0.018 would be a valid address in that same range, and thus for the same purposes.
So, you're probably looking for loopback or loopbackaddress as an answer "with no spaces".
