從主域開始檢視 txt 記錄
neo@netkiller:~$ nslookup -type=txt 163.com找到 spf.163.com 網域名稱，再檢視它的 txt 記錄server: 8.8.8.8
address: 8.8.8.8#53
non-authoritative answer:
163.com text = "v=spf1 include:spf.163.com -all"
authoritative answers can be found from:
neo@netkiller:~$ nslookup -type=txt spf.163.com一次檢視 a.spf.163.com ~ d.spf.163.com 幾個網域名稱server: 8.8.8.8
address: 8.8.8.8#53
non-authoritative answer:
spf.163.com text = "v=spf1 include:a.spf.163.com include:b.spf.163.com include:c.spf.163.com include:d.spf.163.com -all"
authoritative answers can be found from:
neo@netkiller:~$ nslookup -type=txt a.spf.163.com這樣就可以獲得163.com所有郵件伺服器的ip位址server: 8.8.8.8
address: 8.8.8.8#53
non-authoritative answer:
a.spf.163.com text = "v=spf1 ip4:220.181.12.0/22 ip4:220.181.31.0/24 ip4:123.125.50.0/24 ip4:220.181.72.0/24 ip4:123.58.178.0/24 ip4:123.58.177.0/24 ip4:113.108.225.0/24 ip4:218.107.63.0/24 ip4:123.58.189.128/25 -all"
authoritative answers can be found from:
下面我們使用 dig 演示此過程
neo@netkiller:~$ dig -t txt google.com; <<>> dig 9.9.5-11ubuntu1.2-ubuntu <<>> -t txt google.com
;; global options: +cmd
;; got answer:
;; ->>header<<- opcode: query, status: noerror, id: 55272
;; flags: qr rd ra; query: 1, answer: 1, authority: 0, additional: 1
;; opt pseudosection:
; edns: version: 0, flags:; udp: 512
;; question section:
;google.com. in txt
;; answer section:
google.com. 3599 in txt "v=spf1 include:_spf.google.com ~all"
;; query time: 40 msec
;; server: 8.8.8.8#53(8.8.8.8)
;; when: wed feb 24 11:12:01 hkt 2016
;; msg size rcvd: 87
neo@netkiller:~$ dig -t txt _spf.google.com
; <<>> dig 9.9.5-11ubuntu1.2-ubuntu <<>> -t txt _spf.google.com
;; global options: +cmd
;; got answer:
;; ->>header<<- opcode: query, status: noerror, id: 24347
;; flags: qr rd ra; query: 1, answer: 1, authority: 0, additional: 1
;; opt pseudosection:
; edns: version: 0, flags:; udp: 512
;; question section:
;_spf.google.com. in txt
;; answer section:
_spf.google.com. 299 in txt "v=spf1 include:_netblocks.google.com include:_netblocks2.google.com include:_netblocks3.google.com ~all"
;; query time: 45 msec
;; server: 8.8.8.8#53(8.8.8.8)
;; when: wed feb 24 11:12:07 hkt 2016
;; msg size rcvd: 160
neo@netkiller:~$ dig -t txt _netblocks.google.com
; <<>> dig 9.9.5-11ubuntu1.2-ubuntu <<>> -t txt _netblocks.google.com
;; global options: +cmd
;; got answer:
;; ->>header<<- opcode: query, status: noerror, id: 59355
;; flags: qr rd ra; query: 1, answer: 1, authority: 0, additional: 1
;; opt pseudosection:
; edns: version: 0, flags:; udp: 512
;; question section:
;_netblocks.google.com. in txt
;; answer section:
_netblocks.google.com. 3599 in txt "v=spf1 ip4:64.18.0.0/20 ip4:64.233.160.0/19 ip4:66.102.0.0/20 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:74.125.0.0/16 ip4:108.177.8.0/21 ip4:173.194.0.0/16 ip4:207.126.144.0/20 ip4:209.85.128.0/17 ip4:216.58.192.0/19 ip4:216.239.32.0/19 ~all"
;; query time: 42 msec
;; server: 8.8.8.8#53(8.8.8.8)
;; when: wed feb 24 11:12:13 hkt 2016
;; msg size rcvd: 304
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