For those curious on what possible strings could have more collisions (quantity-wise), the L-root servers (the group of root servers operated by ICANN, and by far the most globally distributed of the root servers), I generated a 2-week snapshot at stat.dns.icann.org <http://stat.dns.icann.org/> ; a cached copy of the snapshot is available at http://stats.dns.icann.org/plotcache/L-Root/qtype_vs_othertld/2017-05-01T00:... <http://stats.dns.icann.org/plotcache/L-Root/qtype_vs_othertld/2017-05-01T00:...> , but the list of most queried not delegated TLDs in that snapshot are (in most to least queried order): . home local zghjccbob3n0 dhcp lan ip localdomain z gateway localhost belkin dlink gw== internal invalid corp workgroup homestation dlinkrouter 012 davolink domain null blinkap no-use-now intra loc netis 217 router iptime 1 cpe totolink pk5001z html telus 176 pvt The two patterns in the string are strings suggestive of internal networks (like .corp, .lan and .intra) and strings suggestive of router devices (router vendor names), and some could be both (.home, .gateway). Rubens