-bash-3.2$ dig +trace google.com
; <<>> DiG 9.3.4 <<>> +trace google.com
;; global options: printcmd
. 498902 IN NS L.ROOT-SERVERS.NET.
. 498902 IN NS I.ROOT-SERVERS.NET.
. 498902 IN NS J.ROOT-SERVERS.NET.
. 498902 IN NS B.ROOT-SERVERS.NET.
. 498902 IN NS M.ROOT-SERVERS.NET.
. 498902 IN NS G.ROOT-SERVERS.NET.
. 498902 IN NS E.ROOT-SERVERS.NET.
. 498902 IN NS C.ROOT-SERVERS.NET.
. 498902 IN NS K.ROOT-SERVERS.NET.
. 498902 IN NS H.ROOT-SERVERS.NET.
. 498902 IN NS F.ROOT-SERVERS.NET.
. 498902 IN NS D.ROOT-SERVERS.NET.
. 498902 IN NS A.ROOT-SERVERS.NET.
;; Received 436 bytes from 129.82.100.64#53(129.82.100.64) in 12 ms
com. 172800 IN NS a.gtld-servers.net.
com. 172800 IN NS b.gtld-servers.net.
com. 172800 IN NS c.gtld-servers.net.
com. 172800 IN NS d.gtld-servers.net.
com. 172800 IN NS e.gtld-servers.net.
com. 172800 IN NS f.gtld-servers.net.
com. 172800 IN NS g.gtld-servers.net.
com. 172800 IN NS h.gtld-servers.net.
com. 172800 IN NS i.gtld-servers.net.
com. 172800 IN NS j.gtld-servers.net.
com. 172800 IN NS k.gtld-servers.net.
com. 172800 IN NS l.gtld-servers.net.
com. 172800 IN NS m.gtld-servers.net.
;; Received 488 bytes from 199.7.83.42#53(L.ROOT-SERVERS.NET) in 36 ms
google.com. 172800 IN NS ns1.google.com.
google.com. 172800 IN NS ns2.google.com.
google.com. 172800 IN NS ns3.google.com.
google.com. 172800 IN NS ns4.google.com.
;; Received 164 bytes from 192.26.92.30#53(c.gtld-servers.net) in 66 ms