[SURBL-Discuss] Three level TLDs

Brooke Babcock brooke at usinternet.com
Thu Mar 16 12:50:08 CET 2017

I have a question about the three level TLDs provided by SURBL.

I’m a new user of SURBL and attempting to hook it into our company’s e-mail scanner using the guidelines listed here: http://www.surbl.org/guidelines <http://www.surbl.org/guidelines>. Guideline #2 instructs me to extract the base domain to use in the lookup to SURBL and points me to two different tables - a two level TLD table and the three level TLD table. 

According to the guidelines… “For any domain on the three level list, check it at the fourth level”. However, in the three level TLD table (http://www.surbl.org/static/three-level-tlds <http://www.surbl.org/static/three-level-tlds>), I see many two level domains. In my spot checking, I always see the same domain in the two level TLD table (http://www.surbl.org/static/two-level-tlds <http://www.surbl.org/static/two-level-tlds>) as well.

fvg.it <http://fvg.it/>
ic.tr <http://ic.tr/>
iki.fr <http://iki.fr/>
info.at <http://info.at/>
ro.com <http://ro.com/>

How do I best treat these domains that show up in both lists? Are they on the three level list by mistake? Or should I do multiple lookups with different URI base domains (3 and 4 level) if the top domain is in both lists?

For example, if I were to extract the URI, http://some.domain.fvg.it <http://some.domain.fvg.it/>, should I do a lookup on “some.domain.fvg.it <http://some.domain.fvg.it/>” and “domain.fvg.it <http://domain.fvg.it/>”, because “fvg.it <http://fvg.it/>" appears in both lists?

Any help would be appreciated. Thanks much!


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