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Hostname or IP Type  
Searching for 237.172.158.81.in-addr.arpa. PTR record at A.ROOT-SERVERS.NET. [198.41.0.4] ...took 2 ms
Searching for 237.172.158.81.in-addr.arpa. PTR record at f.in-addr-servers.arpa. [193.0.9.1] ...took 14 ms
Searching for sns-pb.isc.org. A record at D.ROOT-SERVERS.NET. [199.7.91.13] ...took 1 ms
Searching for sns-pb.isc.org. A record at c0.org.afilias-nst.info. [199.19.53.1] ...took 8 ms
Searching for ns.isc.afilias-nst.info. A record at I.ROOT-SERVERS.NET. [192.36.148.17] ...took 1 ms
Searching for ns.isc.afilias-nst.info. A record at b0.info.afilias-nst.org. [199.254.48.1] ...took 8 ms
Searching for ns.isc.afilias-nst.info. A record at ns1.ams1.afilias-nst.info. [65.22.6.79] ...took 114 ms
Searching for sns-pb.isc.org. A record at ns.isc.afilias-nst.info. [199.254.63.254] ...took 9 ms
Searching for 237.172.158.81.in-addr.arpa. PTR record at sns-pb.isc.org. [192.5.4.1] ...took 12 ms
Searching for 237.172.158.81.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 h.gtld-servers.net. [192.54.112.30] ...took 8 ms
Searching for ns0.bt.net. A record at ns1.bt.net. [217.32.105.91] ...took 19 ms
Searching for 237.172.158.81.in-addr.arpa. PTR record at ns0.bt.net. [217.35.209.188] ...took 41 ms
Searching for 237.172.158.81.in-addr.arpa. PTR record at ns21.bt.net. [217.35.209.187] ...took 28 ms
DomainTypeTTLAnswer
237.172.158.81.in-addr.arpa.PTR604800host81-158-172-237.range81-158.btcentralplus.com.



Total elapsed query time: 280 ms