Facebook, like many large internet companies, buys their IP blocks outright, so they show up under their AS number [0]. Facebook seems to have 3 AS numbers [1,2,3] and that IP appears in [3]

[0] https://en.wikipedia.org/wiki/Autonomous_system_%28Internet%...

[1] https://bgp.he.net/AS32934

[2] https://bgp.he.net/AS63293

[3] https://bgp.he.net/AS54115