为什么当我想查看哪个CNAMES有特定的域时，我不能使用dig/nlookup查看它们？nslookup -type=any google.com
CNAMES是否受到公众请愿的保护？命令输出：
;; Truncated, retrying in TCP mode.
Server: 8.8.4.4
Address: 8.8.4.4#53
Non-authoritative answer:
Name: google.com
Address: 142.250.185.206
google.com has AAAA address 2a00:1450:4001:812::200e
google.com mail exchanger = 20 alt1.aspmx.l.google.com.
google.com text = "google-site-verification=wD8N7i1JTNTkezJ49swvWW48f8_9xveREV4oB-0Hf5o"
google.com nameserver = ns2.google.com.
google.com mail exchanger = 10 aspmx.l.google.com.
google.com nameserver = ns3.google.com.
google.com text = "MS=E4A68B9AB2BB9670BCE15412F62916164C0B20BB"
google.com rdata_257 = 0 issue "pki.goog"
google.com text = "globalsign-smime-dv=CDYX+XFHUw2wml6/Gb8+59BsH31KzUr6c1l2BPvqKX8="
google.com nameserver = ns1.google.com.
google.com text = "facebook-domain-verification=22rm551cu4k0ab0bxsw536tlds4h95"
google.com mail exchanger = 30 alt2.aspmx.l.google.com.
google.com text = "v=spf1 include:_spf.google.com ~all"
google.com text = "apple-domain-verification=30afIBcvSuDV2PLX"
google.com text = "docusign=05958488-4752-4ef2-95eb-aa7ba8a3bd0e"
google.com mail exchanger = 50 alt4.aspmx.l.google.com.
google.com text = "google-site-verification=TV9-DBe4R80X4v0M4U_bd_J9cpOJM0nikft0jAgjmsQ"
google.com nameserver = ns4.google.com.
google.com mail exchanger = 40 alt3.aspmx.l.google.com.
google.com
origin = ns1.google.com
mail addr = dns-admin.google.com
serial = 384422044
refresh = 900
retry = 900
expire = 1800
minimum = 60
google.com text = "docusign=1b0a6754-49b1-4db5-8540-d2c12664b289"
Authoritative answers can be found from:
CNAME记录是公共的，您应该能够看到它们。如果你没有看到它们，很可能是因为域根本没有CNAME记录。
尝试几个不同的域，尤其是子域，因为它们通常包含CNAME记录。例如
~ → nslookup -type=CNAME www.pinterest.com
Server: 2001:558:feed::1
Address: 2001:558:feed::1#53
Non-authoritative answer:
www.pinterest.com canonical name = www-pinterest-com.gslb.pinterest.com.
Authoritative answers can be found from: