Question: What is the IPv4 routing prefix for the Department of Defense's legacy IPv4 address block?
Paraphrase: Tell me the Department of Defense's legacy IPv4 address block's IPv4 prefix.
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q11209 p:P3761 ?s . ?s ps:P3761 ?obj . ?s pq:P1552 wd:Q28919811 }