```
$ dig @
223.5.5.5 +trace
swcdn.apple.com; <<>> DiG 9.10.6 <<>> @
223.5.5.5 +trace
swcdn.apple.com; (1 server found)
;; global options: +cmd
. 59299 IN NS
f.root-servers.net.
. 59299 IN NS
c.root-servers.net.
. 59299 IN NS
e.root-servers.net.
. 59299 IN NS
g.root-servers.net.
. 59299 IN NS
i.root-servers.net.
. 59299 IN NS
d.root-servers.net.
. 59299 IN NS
l.root-servers.net.
. 59299 IN NS
b.root-servers.net.
. 59299 IN NS
a.root-servers.net.
. 59299 IN NS
k.root-servers.net.
. 59299 IN NS
h.root-servers.net.
. 59299 IN NS
m.root-servers.net.
. 59299 IN NS
j.root-servers.net.
. 59299 IN RRSIG NS 8 0 518400 20211108170000 20211026160000 14748 . fxvblquc0n0OVj6btUqmBH5KFX2Ez4PXT1B/2kO0nNr2F4CqbVJ1iOzB 9M0eEQGUvk/winR0O6qyq0vPpp/bDg9yEoWFnGAQK2gds98NCalUWpQz oSIwG587xwAApM5e3NpWI5HCHMSvYdF+8zKAMwyzPCssdtW4bafkb9jn D+c5co76GPI+y5/R2fF9Kl2Ll9Ka2mIt2JpW3myGhPMuYiApI7lTFGih diNZn6ssKR7rlCL6dSFHARII3fwFgBW/N6Qk4BgyMbcAdR3byhZY8IKb Fcm/QEoxkvHW3EAU2/bp3DQgWGmUekk8TYphpt5OcbU5TquB8WYBEeGY mu2eNg==
;; Received 525 bytes from 223.5.5.5#53(223.5.5.5) in 343 ms
swcdn.apple.com. 14 IN CNAME
swcdn.apple.com.akadns.net.
swcdn.apple.com.akadns.net. 14 IN CNAME
swcdn.g.aaplimg.com.
swcdn.g.aaplimg.com. 14 IN CNAME
swcdn-na-lb.apple.com.akadns.net.
swcdn-na-lb.apple.com.akadns.net. 14 IN CNAME
swcdn.apple.com.edgesuite.net.
swcdn.apple.com.edgesuite.net. 14 IN CNAME
a1271.dscgi3.akamai.net.
a1271.dscgi3.akamai.net. 14 IN A 23.49.5.165
a1271.dscgi3.akamai.net. 14 IN A 23.49.5.170
;; Received 246 bytes from 192.112.36.4#53(
g.root-servers.net) in 196 ms
```
也是返回 akamai 的
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