对Google API Ip的研究

cg-in-f121.google.com dns information

DNS Lookup For Cg-in-f121.google.com

;; Answer received from 127.0.0.1 (191 bytes)
;;
;; HEADER SECTION
;; id = 48579
;; qr = 1    opcode = QUERY    aa = 0    tc = 0    rd = 1
;; ra = 1    ad = 0    cd = 0    rcode  = NOERROR
;; qdcount = 1  ancount = 1  nscount = 4  arcount = 4

;; QUESTION SECTION (1 record)
;; cg-in-f121.google.com. IN A

;; ANSWER SECTION (1 record)
cg-in-f121.google.com. 86400 IN A 209.85.171.121

;; AUTHORITY SECTION (4 records)
google.com. 43053 IN NS ns4.google.com.
google.com. 43053 IN NS ns2.google.com.
google.com. 43053 IN NS ns3.google.com.
google.com. 43053 IN NS ns1.google.com.

;; ADDITIONAL SECTION (4 records)
ns1.google.com. 197140 IN A 216.239.32.10
ns2.google.com. 24378 IN A 216.239.34.10
ns3.google.com. 98206 IN A 216.239.36.10
ns4.google.com. 176199 IN A 216.239.38.10

tx-in-f141.google.com  72.14.203.141
                            72.14.203.141

cf-in-f141.google.com dns information

DNS Lookup For Cf-in-f141.google.com

;; Answer received from 127.0.0.1 (191 bytes)
;;
;; HEADER SECTION
;; id = 3693
;; qr = 1    opcode = QUERY    aa = 0    tc = 0    rd = 1
;; ra = 1    ad = 0    cd = 0    rcode  = NOERROR
;; qdcount = 1  ancount = 1  nscount = 4  arcount = 4

;; QUESTION SECTION (1 record)
;; cf-in-f141.google.com. IN A

;; ANSWER SECTION (1 record)
cf-in-f141.google.com. 86400 IN A 74.125.19.141

;; AUTHORITY SECTION (4 records)
google.com. 42499 IN NS ns2.google.com.
google.com. 42499 IN NS ns4.google.com.
google.com. 42499 IN NS ns3.google.com.
google.com. 42499 IN NS ns1.google.com.

;; ADDITIONAL SECTION (4 records)
ns1.google.com. 196586 IN A 216.239.32.10
ns2.google.com. 23824 IN A 216.239.34.10
ns3.google.com. 97652 IN A 216.239.36.10
ns4.google.com. 175645 IN A 216.239.38.10