Here are the original DCs from the article (The ENWPJ made some changes). The Base DC is the DC to track the critter. To that, you add the numbers derived from the three tables, below (for what is "known", see the article). If the Base DC is met, you track the critter. If you roll above that, you get more information.
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Here is a portion of the tables, Copyright 2003-4 by SteveC. All Rights Reserved.
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Tracking Information Rolls Exceeding the DCs:
In order to gain the following information from the tracks of various types of creatures, the total (Survival ranks + Wisdom Modifier + Synergy Bonus from Search 5+, plus any other bonuses) must exceed the base Track DC to follow the tracks, by a certain amount. Apply all the applicable modifiers from the three tables, below. If the total (1D20 + Survival skill ranks + Wisdom Modifier + Synergy Bonus from Search 5+, plus any other bonus(es)) equals the base DC exactly, the creature can still be tracked, but no information is gained. If the roll is between the base DC and the modified one, some (but not all) of the desired information will be gained. Tracking generally requires one Survival check per mile, so multiple attempts can be made to gain information, if the trail can be followed that far. As always, if the base DC to track is failed, the would-be tracker can spend an hour "casting about" in order to locate the trail, and try again.
Type and Rarity of the Creature(s) Being Tracked:............DC Modifier:
Known creatures (ignore rarity and/or terrain knowledge):.........+0
Unknown Common creatures:...............................................+0
Unknown Uncommon creatures:............................................+1
Unknown Rare creatures:.....................................................+2
Unknown Very Rare/Unique creatures"....................................+3
Terrain Knowledge:.....................................................DC Modifier:
Known terrain types:..........................................................+0
Unknown terrain type within 100 miles:..................................+4
Unknown terrain type more than 100 miles distant:..................+8
Information to be Gained:.............................................DC:
Type, direction of travel*:..................................................+1
Above, plus number and pace:.............................................+2
Above, plus time of passage**, features:..............................+3
Above, plus natural clues, if any:.........................................+4
Size and weight (for Humanoids, only):..................................+8
Above, plus size, weight, and load carried:.............................+9
