Anyone else seeing DNS oddities from info.net / infonet.com ? fwdrev() { for ip in `dig +short A $1 @$2`; do echo $ip `dig +short -x $ip @$2` done } fwdrev smtp.microsoft.com 8.8.8.8 131.107.115.215 smtp.microsoft.com. mailb.microsoft.com. mail2.microsoft.com. 131.107.115.214 mailc.microsoft.com. mail3.microsoft.com. smtp.microsoft.com. 205.248.106.64 ns1327.ztomy.com. 205.248.106.30 ns1327.ztomy.com. 205.248.106.32 ns1327.ztomy.com. 131.107.115.212 smtp.microsoft.com. mail1.microsoft.com. fwdrev smtp.microsoft.com 1.1.1.1 205.248.106.30 ns1327.ztomy.com. 205.248.106.32 ns1327.ztomy.com. 205.248.106.64 ns1327.ztomy.com. 131.107.115.212 smtp.microsoft.com. mail1.microsoft.com. 131.107.115.214 mailc.microsoft.com. smtp.microsoft.com. mail3.microsoft.com. 131.107.115.215 mailb.microsoft.com. smtp.microsoft.com. mail2.microsoft.com. dig +trace -x 205.248.106.30 ... 248.205.in-addr.arpa. 86400 IN NS dns1.info.net. 248.205.in-addr.arpa. 86400 IN NS dns1.infonet.com. 248.205.in-addr.arpa. 86400 IN NS dnseur.info.net. ;; Received 360 bytes from 193.0.9.10#53(arin.authdns.ripe.net) in 179 ms 30.106.248.205.in-addr.arpa. 300 IN PTR ns1327.ztomy.com. ;; Received 86 bytes from 208.91.197.27#53(dns1.infonet.com) in 217 ms Patrick