nslookup, host, dig commands

nslookup www.google.com
Server:         10.40.4.247
Address:        10.40.4.247#53

Non-authoritative answer:
Name:   www.google.com
Address: 74.125.236.50
Name:   www.google.com
Address: 74.125.236.52
Name:   www.google.com
Address: 74.125.236.51
Name:   www.google.com
Address: 74.125.236.48
Name:   www.google.com
Address: 74.125.236.49

host www.google.com

www.google.com has address 74.125.236.50

www.google.com has address 74.125.236.49

www.google.com has address 74.125.236.52

www.google.com has address 74.125.236.48

www.google.com has address 74.125.236.51

dig www.google.com

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.30.rc1.el6 <<>> www.google.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34580

;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:

;www.google.com.                        IN      A

;; ANSWER SECTION:

www.google.com.         286     IN      A       74.125.236.49

www.google.com.         286     IN      A       74.125.236.52

www.google.com.         286     IN      A       74.125.236.48

www.google.com.         286     IN      A       74.125.236.51

www.google.com.         286     IN      A       74.125.236.50

;; Query time: 0 msec

;; SERVER: 10.40.4.247#53(10.40.4.247)

;; WHEN: Wed Dec 17 16:04:04 2014

;; MSG SIZE  rcvd: 112