How to get all IP Addresses for a host from DNS server?

[atulnandan]

I have a program for which the purpose is to find all IP addresses associated with a host in a particular domain. For example, let's say that i want to find all IP addresses associated with "rediff.com". If i do "nslookup" on rediff.com, i get different set of IP addresses at different point of time as follows:


atul> nslookup rediff.com
Server: ns.otherdnserver.org
Address: 10.12.35.8

Non-authoritative answer:
Name: rediff.com
Address: 64.212.198.153
Name: rediff.com
Address: 64.212.198.144



atul> nslookup rediff.com
Server: ns.otherdnserver.org
Address: 10.12.35.8

Non-authoritative answer:
Name: rediff.com
Address: 168.143.241.10
Name: rediff.com
Address: 168.143.241.90


Same behaviour is observed with gethostbyname() api utility which my program is calling and i am getting different subset of IP addresses at different point of time.

Is there a way where i can invoke gethostbyname() with a hostname with certain specific option and it returns me all IP addresses associated with it in one invocation, not in multiple
invocations as mentioned in the above example?

 

[Noway2]

Try dig. For example: dig any rediff.com gives the following:

; <<>> DiG 9.4-ESV-R4 <<>> any rediff.com
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29815
;; flags: qr rd ra; QUERY: 1, ANSWER: 12, AUTHORITY: 8, ADDITIONAL: 4

;; QUESTION SECTION:
;rediff.com.                    IN      ANY

;; ANSWER SECTION:
rediff.com.             1800    IN      MX      10 mx.rediffmail.rediff.akadns.net.
rediff.com.             1800    IN      SOA     ns1.rediff.com. webmaster.rediff.co.in. 2011051802 86400 7200 3628800 1800
rediff.com.             300     IN      A       202.137.237.21
rediff.com.             300     IN      A       202.137.236.33
rediff.com.             1800    IN      NS      usc2.akam.net.
rediff.com.             1800    IN      NS      ns1-225.akam.net.
rediff.com.             1800    IN      NS      eur4.akam.net.
rediff.com.             1800    IN      NS      use9.akam.net.
rediff.com.             1800    IN      NS      ns1-245.akam.net.
rediff.com.             1800    IN      NS      eur1.akam.net.
rediff.com.             1800    IN      NS      asia2.akam.net.
rediff.com.             1800    IN      NS      use4.akam.net.

;; AUTHORITY SECTION:
rediff.com.             1800    IN      NS      use9.akam.net.
rediff.com.             1800    IN      NS      eur1.akam.net.
rediff.com.             1800    IN      NS      ns1-245.akam.net.
rediff.com.             1800    IN      NS      usc2.akam.net.
rediff.com.             1800    IN      NS      asia2.akam.net.
rediff.com.             1800    IN      NS      eur4.akam.net.
rediff.com.             1800    IN      NS      use4.akam.net.
rediff.com.             1800    IN      NS      ns1-225.akam.net.

;; ADDITIONAL SECTION:
mx.rediffmail.rediff.akadns.net. 58 IN  A       119.252.147.10
eur1.akam.net.          77215   IN      A       213.155.153.132
eur4.akam.net.          3097    IN      A       213.155.153.132
usc2.akam.net.          3079    IN      A       64.215.164.170

;; Query time: 84 msec
;; SERVER: 152.19.240.8#53(152.19.240.8)
;; WHEN: Tue May 24 10:23:09 2011
;; MSG SIZE  rcvd: 509