Based on a short but probably-representative sample, these are all the hostnames that rounded to >=1% of all address (A/AAAA) queries. All samples were collected during one brief window of time. Probably the prevelance of language subdomains follows the sun, but that's not the kind of data we're looking for here (more like domain roots and common targets vs all the project/lang entries). Between them they totaled ~57%, leaving ~43% for the long tail:
1% pt.wikipedia.org.
1% ja.wikipedia.org.
1% es.wikipedia.org.
1% fr.wikipedia.org.
1% de.wikipedia.org.
1% maps.wikimedia.org. # Note upload-addrs, not text-addrs
1% ru.wikipedia.org.
1% commons.wikimedia.org.
1% zh.wikipedia.org.
2% wikimedia.org.
3% wikipedia.org.
7% meta.wikimedia.org.
8% login.wikimedia.org.
8% www.wikipedia.org.
9% en.wikipedia.org.
11% upload.wikimedia.org. # Note upload-addrs, not text-addrs