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Hostname or IP Type  
Searching for 20.255.159.81.in-addr.arpa. PTR record at A.ROOT-SERVERS.NET. [198.41.0.4] ...took 1 ms
Searching for 20.255.159.81.in-addr.arpa. PTR record at e.in-addr-servers.arpa. [203.119.86.101] ...took 309 ms
Searching for sns-pb.isc.org. A record at A.ROOT-SERVERS.NET. [198.41.0.4] ...took 1 ms
Searching for sns-pb.isc.org. A record at a0.org.afilias-nst.info. [199.19.56.1] ...took 277 ms
Searching for sns-pb.isc.org. A record at ord.sns-pb.isc.org. [199.6.0.30] ...took 148 ms
Searching for 20.255.159.81.in-addr.arpa. PTR record at sns-pb.isc.org. [192.5.4.1] ...took 14 ms
Searching for 20.255.159.81.in-addr.arpa. PTR record at ns.ripe.net. [193.0.9.6] ...took 14 ms
SERVFAIL
Searching for ns0.bt.net. A record at A.ROOT-SERVERS.NET. [198.41.0.4] ...took 1 ms
Searching for ns0.bt.net. A record at m.gtld-servers.net. [192.55.83.30] ...took 124 ms
Searching for ns0.bt.net. A record at ns2.bt.net. [217.32.105.90] ...took 19 ms
Searching for 20.255.159.81.in-addr.arpa. PTR record at ns0.bt.net. [217.35.209.188] ...took 26 ms
Searching for 20.255.159.81.in-addr.arpa. PTR record at ns21.bt.net. [217.35.209.187] ...took 27 ms
DomainTypeTTLAnswer
20.255.159.81.in-addr.arpa.PTR604800host81-159-255-20.range81-159.btcentralplus.com.



Total elapsed query time: 961 ms