Chip Campbell wrote:
Thanks, Raymond and Jeff.
Yes, it's weirdness in the dns, but it's not local to our site (we do run our own dns servers).
Here are two queries executed at the main nameservers at the University of Toronto:
$ dig +short @128.100.100.128 twitter.com.multi.surbl.org 4.36.66.178 $ dig +short @128.100.102.201 twitter.com.multi.surbl.org 202.106.1.2
And here's two executed at York University, also in Toronto:
$ dig +short @130.63.168.21 twitter.com.multi.surbl.org 216.234.179.13 $ dig +short @130.63.237.99 twitter.com.multi.surbl.org 203.161.230.171
I confirm...
[martins@localhost ~]$ host twitter.com.multi.surbl.org. Host twitter.com.multi.surbl.org. not found: 3(NXDOMAIN) [martins@localhost ~]$ host twitter.com.multi.surbl.org. twitter.com.multi.surbl.org has address 209.145.54.50 Host twitter.com.multi.surbl.org not found: 3(NXDOMAIN) Host twitter.com.multi.surbl.org not found: 3(NXDOMAIN) [martins@localhost ~]$ host twitter.com.multi.surbl.org. Host twitter.com.multi.surbl.org. not found: 3(NXDOMAIN) [martins@localhost ~]$ host twitter.com.multi.surbl.org. twitter.com.multi.surbl.org has address 203.161.230.171 Host twitter.com.multi.surbl.org not found: 3(NXDOMAIN) Host twitter.com.multi.surbl.org not found: 3(NXDOMAIN) [martins@localhost ~]$ host twitter.com.multi.surbl.org.| grep -v NXDOMAIN [martins@localhost ~]$ host twitter.com.multi.surbl.org. | grep -v NXDOMAIN [martins@localhost ~]$ host twitter.com.multi.surbl.org. | grep -v NXDOMAIN [martins@localhost ~]$ host twitter.com.multi.surbl.org. | grep -v NXDOMAIN twitter.com.multi.surbl.org has address 211.94.66.147 [martins@localhost ~]$ host twitter.com.multi.surbl.org. | grep -v NXDOMAIN [martins@localhost ~]$ host twitter.com.multi.surbl.org. | grep -v NXDOMAIN twitter.com.multi.surbl.org has address 216.234.179.13 [martins@localhost ~]$ host twitter.com.multi.surbl.org. | grep -v NXDOMAIN [martins@localhost ~]$ host twitter.com.multi.surbl.org. | grep -v NXDOMAIN [martins@localhost ~]$ host twitter.com.multi.surbl.org. | grep -v NXDOMAIN [martins@localhost ~]$ host twitter.com.multi.surbl.org. | grep -v NXDOMAIN [martins@localhost ~]$ host twitter.com.multi.surbl.org. | grep -v NXDOMAIN [martins@localhost ~]$ host twitter.com.multi.surbl.org. | grep -v NXDOMAIN [martins@localhost ~]$ host twitter.com.multi.surbl.org. | grep -v NXDOMAIN [martins@localhost ~]$ host twitter.com.multi.surbl.org. | grep -v NXDOMAIN twitter.com.multi.surbl.org has address 216.234.179.13 [martins@localhost ~]$ host twitter.com.multi.surbl.org. | grep -v NXDOMAIN [martins@localhost ~]$ host twitter.com.multi.surbl.org. | grep -v NXDOMAIN twitter.com.multi.surbl.org has address 211.94.66.147 [martins@localhost ~]$