Pareto principle states that roughly 80% of the effects are caused by 20% of the events .wikipedia says : “Pareto, who observed in 1906 that 80% of the land in Italy was owned by 20% of the population; Pareto developed the principle by observing that 20% of the pea pods in his garden contained 80% of the peas.”

Applying this to gTLD, do 80% of domains come from 20% of gTLDs ? We counted domains in 3 ways :
– Number of second level domains written in the zone files
– Number of “non parked” second level domains
– Number of second level domains identified by Google in the search “site:.gTLD” where you put the gTLD string ( e.g., or

Looking at the number of second level domains registered, 50 gTLD own 80% of domains name, out of 250. That is exactly 20% !!
Now looking at non parked domains, we need go a bit further – 65 gTLD are necessary to have 80% of non parked total domain names – that is around 30%
Google Activity is much more spread out – you nearly need 40% of gtLDs to get 80% of the new TLD google activity.