A total of 22 sites are hosted on 54.173.160.130.
Here are the first 5 as they would appear when searched for:
runkeeper.com/user/ksibe
(null)
runkeeper.com/user/erijavec
(null)
runkeeper.com/user/fezzifezzino
(null)
runkeeper.com/user/nevillehawkins
(null)
runkeeper.com/user/jorispijpen
(null)
...and the list of the remaining 17:
runkeeper.com/user/zarflax
runkeeper.com/user/1101919046
runkeeper.com/user/T2LH
runkeeper.com/user/hyna0310
runkeeper.com/user/rohitar
runkeeper.com/user/Arreola
runkeeper.com/user/elchangoloco
runkeeper.com/user/gangachanga
runkeeper.com/user/1259184398
runkeeper.com/user/windplus
runkeeper.com/user/liakalek
runkeeper.com/user/wexler
runkeeper.com/user/gliedl
runkeeper.com/user/florisvoorveld
runkeeper.com/user/glendc
runkeeper.com/user/Colin1065