dig +trace option

Can't believe I didn't know about this years ago:

jemurray@glock:~$ dig +trace @2001:470:20::2 any unixhosts.us

; <<>> DiG 9.4.2-P2 <<>> +trace @2001:470:20::2 any unixhosts.us
; (1 server found)
;; global options:  printcmd
.   354563 IN NS h.root-servers.net.
.   354563 IN NS k.root-servers.net.
.   354563 IN NS m.root-servers.net.
.   354563 IN NS j.root-servers.net.
.   354563 IN NS a.root-servers.net.
.   354563 IN NS l.root-servers.net.
.   354563 IN NS b.root-servers.net.
.   354563 IN NS f.root-servers.net.
.   354563 IN NS c.root-servers.net.
.   354563 IN NS d.root-servers.net.
.   354563 IN NS e.root-servers.net.
.   354563 IN NS i.root-servers.net.
.   354563 IN NS g.root-servers.net.
;; Received 497 bytes from 2001:470:20::2#53(2001:470:20::2) in 32 ms

us.   172800 IN NS K.GTLD.BIZ.
us.   172800 IN NS B.GTLD.BIZ.
us.   172800 IN NS I.GTLD.BIZ.
us.   172800 IN NS J.GTLD.BIZ.
us.   172800 IN NS C.GTLD.BIZ.
us.   172800 IN NS A.GTLD.BIZ.
;; Received 298 bytes from 128.8.10.90#53(d.root-servers.net) in 49 ms

unixhosts.us.  7200 IN NS GLOCK.BUYAGUN.ORG.
unixhosts.us.  7200 IN NS P6.NTS.WUSTL.EDU.
;; Received 91 bytes from 2001:503:d1ae:ffff:ffff:ffff:ffff:ff7e#53(I.GTLD.BIZ) in 60 ms

unixhosts.us.  86400 IN SOA glock.buyagun.org. jemurray.zweck.net. 1 604800 86400 2419200 86400
unixhosts.us.  86400 IN NS glock.buyagun.org.
unixhosts.us.  86400 IN AAAA 2001:4978:f:3db::2
unixhosts.us.  86400 IN MX 10 unixhosts.us.
;; Received 159 bytes from 2001:4978:f:3db::2#53(GLOCK.BUYAGUN.ORG) in 0 ms