Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '157.240.156.0'
+180
ERRNo PTR record availible DNS server 'b.ns.facebook.com' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.156.240.157.in-addr.arpa'.