[SURBL-Discuss] Lookup web page not showing blacklisted urls?

[Chip Campbell]

There are sites which return with IP addresses to dns lookups, but which
report as "not blacklisted" when I submit them to the lookup web page.
 
For example,
 
% dig +short twitter.com.multi.surbl.org
4.36.66.178
% dig +short test.surbl.org.multi.surbl.org
127.0.0.126

But when I enter twitter.com into http://george.surbl.org/lookup.html,
it says "twitter.com is not blacklisted" in a green box. Same for
test.surbl.org.
 
What am I missing?

Chip C
Toronto