As of about an hour ago AT&T appear to have started blocking access to a few of our IP addresses. This is being done at a /32 level, and the IP addresses above and below are still allowed through. Has anyone seen them do this before, or know who I need to contact to get it fixed? AT&T won't talk to me as I'm not a customer... Traceroute to the blocked IPs from AT&T all end at : 5 cr2.phlpa.ip.att.net (12.122.3.226) [MPLS: Labels 20559/17406 Exp 0] 116 msec 20 msec 20 msec 6 cr2.cl2oh.ip.att.net (12.122.2.209) [MPLS: Labels 20527/17406 Exp 0] 24 msec 20 msec 20 msec 7 cr1.cl2oh.ip.att.net (12.122.2.125) [MPLS: Labels 0/17406 Exp 0] 24 msec 20 msec 20 msec 8 cr82.dtrmi.ip.att.net (12.123.139.154) [MPLS: Label 16623 Exp 0] 24 msec 20 msec 20 msec 9 gar4.dtrmi.ip.att.net (12.122.102.89) 20 msec 20 msec 20 msec 10 12.87.238.238 [AS 7018] 24 msec 20 msec 24 msec 11 12.87.238.237 [AS 7018] !A * * Traceroute to the neighboring IP addresses don't go anywhere near the above path, so it's apparently a blackhole of sorts. Scott.