Reverse DNS Lookup for 172.56.221.87

Searching for 87.221.56.172.in-addr.arpa. PTR record at M.ROOT-SERVERS.NET. [202.12.27.33] ...took 14 ms
Searching for 87.221.56.172.in-addr.arpa. PTR record at b.in-addr-servers.arpa. [199.253.183.183] ...took 6 ms

Searching for z.arin.net. A record at M.ROOT-SERVERS.NET. [202.12.27.33] ...took 15 ms
Searching for z.arin.net. A record at e.gtld-servers.net. [192.12.94.30] ...took 25 ms
Searching for z.arin.net. A record at ns1.arin.net. [199.212.0.108] ...took 92 ms

Searching for 87.221.56.172.in-addr.arpa. PTR record at z.arin.net. [199.180.180.63] ...took 92 ms

Searching for ns10.tmobileus.com. A record at M.ROOT-SERVERS.NET. [202.12.27.33] ...took 14 ms
Searching for ns10.tmobileus.com. A record at f.gtld-servers.net. [192.35.51.30] ...took 6 ms
Searching for ns10.tmobileus.com. A record at ns10.tmobileus.com. [208.54.147.200] ...took 161 ms

Searching for 87.221.56.172.in-addr.arpa. PTR record at ns10.tmobileus.com. [208.54.147.200] ...took 161 ms
REFUSED

Searching for ns10.tmobileus.net. A record at M.ROOT-SERVERS.NET. [202.12.27.33] ...took 14 ms
Searching for ns10.tmobileus.net. A record at i.gtld-servers.net. [192.43.172.30] ...took 6 ms
Searching for ns10.tmobileus.net. A record at auth1.dns.cogentco.com. [66.28.0.14] ...took 11 ms

Searching for 87.221.56.172.in-addr.arpa. PTR record at ns10.tmobileus.net. [208.54.99.244] ...took 123 ms
REFUSED
Searching for 87.221.56.172.in-addr.arpa. PTR record at ns10.tmobileus.net. [208.54.99.244] ...took 125 ms
REFUSED
Searching for 87.221.56.172.in-addr.arpa. PTR record at ns10.tmobileus.com. [208.54.147.200] ...took 162 ms
REFUSED

None of the nameservers responded correctly.

Total elapsed query time: 1,027 ms