This is the official list of Australian Ultra Running records that have met the agreed criteria. There isn't a good source for World Ultra Running records but the International Assoc of Ultrarunners has a creditable list of current world rankings. A list of 48hour world best performances (male & female) from mid-2003 is available here.
At any time additional better times/ distances may have been set, but these may not listed here because they are still going through the process of being proved and assessed or there was insufficient documntation.
Please see the following as required:
Australian Ultramarathon Records List