Near as I can tell, the network that your nameservers are in, 68.168.144.0/20 is being correctly announced by AS21560 which is "Netstream Communications". I see this announcement here. A traceroute goes as far as, 13 te0-3-1-7.agr22.atl01.atlas.cogentco.com (154.54.47.190) 97.933 ms te0-3-1-7.agr21.atl01.atlas.cogentco.com (154.54.30.94) 114.202 ms be2149.ccr42.jfk02.atlas.cogentco.com (154.54.31.126) 93.931 ms 14 be2112.ccr41.atl01.atlas.cogentco.com (154.54.7.158) 100.736 ms te0-0-2-0.nr11.b000173-2.atl01.atlas.cogentco.com (154.24.14.118) 100.019 ms be2112.ccr41.atl01.atlas.cogentco.com (154.54.7.158) 100.691 ms 15 te0-4-1-7.agr21.atl01.atlas.cogentco.com (154.54.44.178) 101.480 ms te0-3-1-7.agr22.atl01.atlas.cogentco.com (154.54.47.190) 101.860 ms 38.88.191.250 (38.88.191.250) 99.150 ms 16 te0-0-2-3.nr11.b000173-2.atl01.atlas.cogentco.com (154.24.15.10) 102.828 ms looks like something within Netstream or between them and Cogent. Also both your nameservers seem to be right beside each other in the same netblock -- that's not really the best idea for just this sort of reason. It'd be a good idea to have secondary nameservers somewhere else (Esgob do free secondary anycast DNS and they're nice folk). -w -- William Waites <wwaites@tardis.ed.ac.uk> | School of Informatics http://tardis.ed.ac.uk/~wwaites/ | University of Edinburgh https://hubs.net.uk/ | HUBS AS60241 The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.