Ironically I was just looking at nslookup's man page[1] the other day and this bit of history is hinted at there: class=value Change the query class t

Ironically I was just looking at nslookup's man page[1] the other day and this bit of history is hinted at there: class=value Change the query class to one of: IN the Internet class CH the Chaos class HS the Hesiod class ANY wildcard Man pages have amazing nuggets of history in them if one chooses to dig in! [1] https://linux.die.net/man/1/nslookup https://linux.die.net/man/1/nslookup